diff --git a/package-lock.json b/package-lock.json
index 9986f1b45..95bf935b4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,7 +24,7 @@
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@@ -2493,28 +2514,35 @@
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@@ -2523,19 +2551,25 @@
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@@ -2631,10 +2789,19 @@
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-        "eslint": "^8.57.0 || ^9.0.0",
-        "typescript": ">=4.8.4 <6.0.0"
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
       }
     },
     "node_modules/@typescript-eslint/visitor-keys": {
@@ -5491,10 +5658,11 @@
       "peer": true
     },
     "node_modules/semver": {
-      "version": "7.7.3",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
-      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
+      "version": "7.7.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
+      "integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
       "dev": true,
+      "license": "ISC",
       "bin": {
         "semver": "bin/semver.js"
       },
@@ -5903,10 +6071,11 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.2.tgz",
+      "integrity": "sha512-bGdAIrZ0wiGDo5l8c++HWtbaNCWTS4UTv7RaTH/ThVIgjkveJt83m74bBHMJkuCbslY8ixgLBVZJIOiQlQTjfQ==",
       "dev": true,
+      "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
diff --git a/package.json b/package.json
index 9bc8ffb2b..e7e5015f1 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "eslint": "^9.39.2",
     "globals": "^17.3.0",
     "prettier": "^3.8.1",
-    "typescript": "^5.9.3",
+    "typescript": "^6.0.0",
     "vitepress": "^1.6.4",
     "vitest": "^4.1.4"
   },
diff --git a/packages/owl/src/common/utils.ts b/packages/owl/src/common/utils.ts
index 95ea39019..b3c3ec725 100644
--- a/packages/owl/src/common/utils.ts
+++ b/packages/owl/src/common/utils.ts
@@ -12,7 +12,7 @@ export function parseXML(xml: string): XMLDocument {
   const doc = parser.parseFromString(xml, "text/xml");
   if (doc.getElementsByTagName("parsererror").length) {
     let msg = "Invalid XML in template.";
-    const parsererrorText = doc.getElementsByTagName("parsererror")[0].textContent;
+    const parsererrorText = doc.getElementsByTagName("parsererror")[0]!.textContent;
     if (parsererrorText) {
       msg += "\nThe parser has produced the following error message:\n" + parsererrorText;
       const re = /\d+/g;
diff --git a/packages/owl/src/compiler/code_generator.ts b/packages/owl/src/compiler/code_generator.ts
index c6339e214..a4f3dc9e1 100644
--- a/packages/owl/src/compiler/code_generator.ts
+++ b/packages/owl/src/compiler/code_generator.ts
@@ -535,7 +535,7 @@ export class CodeGenerator {
     const bareArrowMatch = !arrowMatch && compiled.match(/^([a-zA-Z_$][a-zA-Z0-9_$]*)\s*=>/);
 
     if (arrowMatch) {
-      const inner = arrowMatch[1].slice(1, -1).trim();
+      const inner = arrowMatch[1]!.slice(1, -1).trim();
       const rest = compiled.slice(arrowMatch[0].length);
       hoistedExpr = inner ? `(ctx,${inner})=>${rest}` : `(ctx)=>${rest}`;
     } else if (bareArrowMatch) {
@@ -573,14 +573,14 @@ export class CodeGenerator {
     for (let key in ast.attrs) {
       let expr, attrName;
       if (key.startsWith("t-attf")) {
-        expr = interpolate(ast.attrs[key]);
+        expr = interpolate(ast.attrs[key]!);
         const idx = block!.insertData(expr, "attr");
 
         attrName = key.slice(7);
         attrs["block-attribute-" + idx] = attrName;
       } else if (key.startsWith("t-att")) {
         attrName = key === "t-att" ? null : key.slice(6);
-        expr = compileExpr(ast.attrs[key]);
+        expr = compileExpr(ast.attrs[key]!);
         if (attrName && isProp(ast.tag, attrName)) {
           if (attrName === "readonly") {
             // the property has a different name than the attribute
@@ -605,11 +605,11 @@ export class CodeGenerator {
         }
       } else if (this.translatableAttributes.includes(key)) {
         const attrTranslationCtx = ast.attrsTranslationCtx?.[key] || ctx.translationCtx;
-        attrs[key] = this.translateFn(ast.attrs[key], attrTranslationCtx);
+        attrs[key] = this.translateFn(ast.attrs[key]!, attrTranslationCtx);
       } else {
-        expr = `"${ast.attrs[key]}"`;
+        expr = `"${ast.attrs[key]!}"`;
         attrName = key;
-        attrs[key] = ast.attrs[key];
+        attrs[key] = ast.attrs[key]!;
       }
 
       if (attrName === "value" && ctx.tModelSelectedExpr) {
@@ -679,7 +679,7 @@ export class CodeGenerator {
 
     // event handlers
     for (let ev in ast.on) {
-      const name = this.generateHandlerCode(ev, ast.on[ev]);
+      const name = this.generateHandlerCode(ev, ast.on[ev]!);
       const idx = block!.insertData(name, "hdlr");
       attrs[`block-handler-${idx}`] = ev;
     }
@@ -708,7 +708,7 @@ export class CodeGenerator {
       block!.currentDom = dom;
       const children = ast.content;
       for (let i = 0; i < children.length; i++) {
-        const child = ast.content[i];
+        const child = ast.content[i]!;
         const subCtx = createContext(ctx, {
           block,
           index: block!.childNumber,
@@ -729,11 +729,11 @@ export class CodeGenerator {
       if (block!.children.length && block!.hasDynamicChildren) {
         const code = this.target.code;
         const children = block!.children.slice();
-        let current = children.shift();
+        let current = children.shift()!;
         for (let i = codeIdx; i < code.length; i++) {
-          if (code[i].trimStart().startsWith(`const ${current!.varName} `)) {
-            code[i] = code[i].replace(`const ${current!.varName}`, current!.varName);
-            current = children.shift();
+          if (code[i]!.trimStart().startsWith(`const ${current.varName} `)) {
+            code[i] = code[i]!.replace(`const ${current.varName}`, current.varName);
+            current = children.shift()!;
             if (!current) break;
           }
         }
@@ -817,11 +817,11 @@ export class CodeGenerator {
       if (block!.children.length) {
         const code = this.target.code;
         const children = block!.children.slice();
-        let current = children.shift();
+        let current = children.shift()!;
         for (let i = codeIdx; i < code.length; i++) {
-          if (code[i].trimStart().startsWith(`const ${current!.varName} `)) {
-            code[i] = code[i].replace(`const ${current!.varName}`, current!.varName);
-            current = children.shift();
+          if (code[i]!.trimStart().startsWith(`const ${current.varName} `)) {
+            code[i] = code[i]!.replace(`const ${current.varName}`, current.varName);
+            current = children.shift()!;
             if (!current) break;
           }
         }
@@ -914,7 +914,7 @@ export class CodeGenerator {
         // Check if there are non-DOM directives (like t-set) after the DOM child.
         // If so, defer the return so those directives are compiled before it.
         const shouldDefer =
-          !this.target.hasRoot && ast.content[ast.content.length - 1].hasNoRepresentation;
+          !this.target.hasRoot && ast.content[ast.content.length - 1]!.hasNoRepresentation;
         if (shouldDefer) {
           this.target.deferReturn = true;
         }
@@ -932,7 +932,7 @@ export class CodeGenerator {
     }
     let index = 0;
     for (let i = 0, l = ast.content.length; i < l; i++) {
-      const child = ast.content[i];
+      const child = ast.content[i]!;
       const forceNewBlock = !child.hasNoRepresentation;
       const subCtx = createContext(ctx, {
         block,
@@ -948,11 +948,11 @@ export class CodeGenerator {
       if (block!.hasDynamicChildren && block!.children.length) {
         const code = this.target.code;
         const children = block!.children.slice();
-        let current = children.shift();
+        let current = children.shift()!;
         for (let i = codeIdx; i < code.length; i++) {
-          if (code[i].trimStart().startsWith(`const ${current!.varName} `)) {
-            code[i] = code[i].replace(`const ${current!.varName}`, current!.varName);
-            current = children.shift();
+          if (code[i]!.trimStart().startsWith(`const ${current.varName} `)) {
+            code[i] = code[i]!.replace(`const ${current.varName}`, current.varName);
+            current = children.shift()!;
             if (!current) break;
           }
         }
@@ -1110,7 +1110,7 @@ export class CodeGenerator {
     }
     if (name.includes(".")) {
       let [_name, suffix] = name.split(".");
-      name = _name;
+      name = _name!;
       switch (suffix) {
         case "bind":
           value = `(${value}).bind(this)`;
@@ -1155,14 +1155,15 @@ export class CodeGenerator {
 
     for (let p in ast.props || {}) {
       let [name, suffix] = p.split(".");
+      name = name!;
 
       if (suffix) {
         // .alike, .bind, .translate — delegate to formatProp, no propList entry
-        props.push(this.formatProp(p, ast.props![p], ast.propsTranslationCtx, ctx.translationCtx));
+        props.push(this.formatProp(p, ast.props![p]!, ast.propsTranslationCtx, ctx.translationCtx));
         continue;
       }
 
-      const { expr: compiledValue, freeVariables } = processExpr(ast.props![p]);
+      const { expr: compiledValue, freeVariables } = processExpr(ast.props![p]!);
 
       const propName = /^[a-z_]+$/i.test(name) ? name : `'${name}'`;
       props.push(`${propName}: ${compiledValue || undefined}`);
@@ -1183,21 +1184,21 @@ export class CodeGenerator {
     if (ast.slots) {
       let slotStr: string[] = [];
       for (let slotName in ast.slots) {
-        const slotAst = ast.slots[slotName];
+        const slotAst = ast.slots[slotName]!;
         const params = [];
         if (slotAst.content) {
           const name = this.compileInNewTarget("slot", slotAst.content, ctx, slotAst.on);
           params.push(`__render: ${name}.bind(this), __ctx: ctx`);
         }
-        const scope = ast.slots[slotName].scope;
+        const scope = slotAst.scope;
         if (scope) {
           params.push(`__scope: "${scope}"`);
         }
-        if (ast.slots[slotName].attrs) {
+        if (slotAst.attrs) {
           params.push(
             ...this.formatPropObject(
-              ast.slots[slotName].attrs!,
-              ast.slots[slotName].attrsTranslationCtx,
+              slotAst.attrs!,
+              slotAst.attrsTranslationCtx,
               ctx.translationCtx
             )
           );
@@ -1285,7 +1286,7 @@ export class CodeGenerator {
       let handlerId = generateId("hdlr");
       let idx = handlers.push(handlerId) - 1;
       spec[ev] = idx;
-      const handler = this.generateHandlerCode(ev, on[ev]);
+      const handler = this.generateHandlerCode(ev, on[ev]!);
       this.define(handlerId, handler);
     }
     this.staticDefs.push({ id: name, expr: `createCatcher(${JSON.stringify(spec)})` });
@@ -1309,7 +1310,7 @@ export class CodeGenerator {
       this.slotNames.add(ast.name);
     }
     const attrs = { ...ast.attrs };
-    const dynProps = attrs["t-props"];
+    const dynProps = attrs["t-props"] ?? null;
     delete attrs["t-props"];
     let key = this.target.loopLevel ? `key${this.target.loopLevel}` : "key";
     if (isMultiple) {
diff --git a/packages/owl/src/compiler/inline_expressions.ts b/packages/owl/src/compiler/inline_expressions.ts
index b4b2a1aa6..a57372a9d 100644
--- a/packages/owl/src/compiler/inline_expressions.ts
+++ b/packages/owl/src/compiler/inline_expressions.ts
@@ -129,8 +129,8 @@ let tokenizeNumber: Tokenizer = function (expr) {
   let s = expr[0];
   if (s && s.match(/[0-9]/)) {
     let i = 1;
-    while (expr[i] && expr[i].match(/[0-9]|\./)) {
-      s += expr[i];
+    while (expr[i] && expr[i]!.match(/[0-9]|\./)) {
+      s += expr[i]!
       i++;
     }
     return { type: "VALUE", value: s };
@@ -143,12 +143,12 @@ let tokenizeSymbol: Tokenizer = function (expr) {
   let s = expr[0];
   if (s && s.match(/[a-zA-Z_\$]/)) {
     let i = 1;
-    while (expr[i] && expr[i].match(/[\w\$]/)) {
-      s += expr[i];
+    while (expr[i] && expr[i]!.match(/[\w\$]/)) {
+      s += expr[i]!
       i++;
     }
     if (s in WORD_REPLACEMENT) {
-      return { type: "OPERATOR", value: WORD_REPLACEMENT[s], size: s.length };
+      return { type: "OPERATOR", value: WORD_REPLACEMENT[s]!, size: s.length };
     }
     return { type: "SYMBOL", value: s };
   } else {
@@ -159,7 +159,7 @@ let tokenizeSymbol: Tokenizer = function (expr) {
 const tokenizeStatic: Tokenizer = function (expr) {
   const char = expr[0];
   if (char && char in STATIC_TOKEN_MAP) {
-    return { type: STATIC_TOKEN_MAP[char], value: char };
+    return { type: STATIC_TOKEN_MAP[char]!, value: char };
   }
   return false;
 };
@@ -277,7 +277,7 @@ export function processExpr(expr: string): ProcessedExpr {
   let topLevelArrowIndex = -1;
 
   while (i < tokens.length) {
-    let token = tokens[i];
+    let token = tokens[i]!;
     let prevToken = tokens[i - 1];
     let nextToken = tokens[i + 1];
     let groupType = stack[stack.length - 1];
@@ -301,10 +301,10 @@ export function processExpr(expr: string): ProcessedExpr {
         if (
           groupType === "LEFT_BRACE" &&
           isLeftSeparator(prevToken) &&
-          isRightSeparator(nextToken)
+          nextToken && isRightSeparator(nextToken)
         ) {
           tokens.splice(i + 1, 0, { type: "COLON", value: ":" }, { ...token });
-          nextToken = tokens[i + 1];
+          nextToken = tokens[i + 1]!;
         }
 
         if (prevToken.type === "OPERATOR" && prevToken.value === ".") {
@@ -325,10 +325,10 @@ export function processExpr(expr: string): ProcessedExpr {
       }
       if (token.type === "RIGHT_PAREN") {
         let j = i - 1;
-        while (j > 0 && tokens[j].type !== "LEFT_PAREN") {
-          if (tokens[j].type === "SYMBOL" && tokens[j].originalValue) {
-            tokens[j].value = tokens[j].originalValue!;
-            localVars.add(tokens[j].value);
+        while (j > 0 && tokens[j]!.type !== "LEFT_PAREN") {
+          if (tokens[j]!.type === "SYMBOL" && tokens[j]!.originalValue) {
+            tokens[j]!.value = tokens[j]!.originalValue!;
+            localVars.add(tokens[j]!.value);
           }
           j--;
         }
@@ -363,7 +363,7 @@ export function processExpr(expr: string): ProcessedExpr {
     freeVariables = [];
     const seen = new Set<string>();
     for (let i = topLevelArrowIndex + 1; i < tokens.length; i++) {
-      const t = tokens[i];
+      const t = tokens[i]!;
       if (t.varName && !t.isLocal && t.varName !== "this" && !seen.has(t.varName)) {
         seen.add(t.varName);
         freeVariables.push(t.varName);
diff --git a/packages/owl/src/compiler/parser.ts b/packages/owl/src/compiler/parser.ts
index 2e68876ab..506594395 100644
--- a/packages/owl/src/compiler/parser.ts
+++ b/packages/owl/src/compiler/parser.ts
@@ -291,7 +291,7 @@ function parseTCustom(node: Element, ctx: ParsingContext): AST | null {
       throw new OwlError("Missing custom directive name with t-custom directive");
     }
     if (attr.startsWith("t-custom-")) {
-      const directiveName = attr.split(".")[0].slice(9);
+      const directiveName = attr.split(".")[0]!.slice(9);
       const customDirective = ctx.customDirectives[directiveName];
       if (!customDirective) {
         throw new OwlError(`Custom directive "${directiveName}" is not defined`);
@@ -704,7 +704,7 @@ function parseComponent(node: Element, ctx: ParsingContext): AST | null {
     );
   }
 
-  if (!(firstLetter === firstLetter.toUpperCase() || isDynamic)) {
+  if (!(firstLetter === firstLetter!.toUpperCase() || isDynamic)) {
     return null;
   }
   if (isDynamic) {
@@ -760,7 +760,7 @@ function parseComponent(node: Element, ctx: ParsingContext): AST | null {
       let el = slotNode.parentElement!;
       let isInSubComponent = false;
       while (el && el !== clone) {
-        if (el!.hasAttribute("t-component") || el!.tagName[0] === el!.tagName[0].toUpperCase()) {
+        if (el!.hasAttribute("t-component") || el!.tagName[0] === el!.tagName[0]!.toUpperCase()) {
           isInSubComponent = true;
           break;
         }
@@ -960,7 +960,7 @@ function parseChildNodes(node: Element, ctx: ParsingContext): AST | null {
     case 0:
       return null;
     case 1:
-      return children[0];
+      return children[0]!;
     default:
       return makeASTMulti(children);
   }
@@ -977,10 +977,10 @@ function parseChildNodes(node: Element, ctx: ParsingContext): AST | null {
 function normalizeTIf(el: Element) {
   let tbranch = el.querySelectorAll("[t-elif], [t-else]");
   for (let i = 0, ilen = tbranch.length; i < ilen; i++) {
-    let node = tbranch[i];
+    let node = tbranch[i]!;
     let prevElem = node.previousElementSibling!;
     let pattr = (name: string) => prevElem.getAttribute(name);
-    let nattr = (name: string) => +!!node.getAttribute(name);
+    let nattr = (name: string) => +!!node!.getAttribute(name);
     if (prevElem && (pattr("t-if") || pattr("t-elif"))) {
       if (pattr("t-foreach")) {
         throw new OwlError(
@@ -1021,7 +1021,7 @@ function normalizeTIf(el: Element) {
  */
 function normalizeTOut(el: Element) {
   const elements = [...el.querySelectorAll(`[t-out]`)].filter(
-    (el) => el.tagName[0] === el.tagName[0].toUpperCase() || el.hasAttribute("t-component")
+    (el) => el.tagName[0] === el.tagName[0]!.toUpperCase() || el.hasAttribute("t-component")
   );
   for (const el of elements) {
     if (el.childNodes.length) {
diff --git a/packages/owl/src/compiler/standalone/index.ts b/packages/owl/src/compiler/standalone/index.ts
index 793ad4ebd..1236d9494 100644
--- a/packages/owl/src/compiler/standalone/index.ts
+++ b/packages/owl/src/compiler/standalone/index.ts
@@ -62,7 +62,7 @@ export async function compileTemplates(paths: string[]) {
     const fileContent = xmlStrings[i];
     process.stdout.write(`.`);
     const parser = new DOMParser();
-    const doc = parser.parseFromString(fileContent, "text/xml");
+    const doc = parser.parseFromString(fileContent!, "text/xml");
     for (const template of doc.querySelectorAll("[t-name]")) {
       const name = template.getAttribute("t-name");
       if (template.hasAttribute("owl")) {
diff --git a/packages/owl/src/runtime/blockdom/attributes.ts b/packages/owl/src/runtime/blockdom/attributes.ts
index 09789deb9..8be73134a 100644
--- a/packages/owl/src/runtime/blockdom/attributes.ts
+++ b/packages/owl/src/runtime/blockdom/attributes.ts
@@ -121,7 +121,7 @@ function toClassObj(expr: string | number | { [c: string]: any }) {
       }
       let words = split.call(str, wordRegexp);
       for (let i = 0, l = words.length; i < l; i++) {
-        result[words[i]] = true;
+        result[words[i]!] = true;
       }
       return result;
     case "object":
@@ -159,7 +159,7 @@ const CSS_PROP_CACHE: { [key: string]: string } = {};
 
 function toKebabCase(prop: string): string {
   if (prop in CSS_PROP_CACHE) {
-    return CSS_PROP_CACHE[prop];
+    return CSS_PROP_CACHE[prop]!;
   }
   const result = prop.replace(/[A-Z]/g, (m) => "-" + m.toLowerCase());
   CSS_PROP_CACHE[prop] = result;
diff --git a/packages/owl/src/runtime/blockdom/block_compiler.ts b/packages/owl/src/runtime/blockdom/block_compiler.ts
index add4ccc07..c75055b38 100644
--- a/packages/owl/src/runtime/blockdom/block_compiler.ts
+++ b/packages/owl/src/runtime/blockdom/block_compiler.ts
@@ -62,7 +62,7 @@ const cache: { [key: string]: BlockType } = {};
  */
 export function createBlock(str: string): BlockType {
   if (str in cache) {
-    return cache[str];
+    return cache[str]!;
   }
 
   // step 0: prepare html base element
@@ -175,8 +175,8 @@ function buildTree(
         }
         const attrs = (node as Element).attributes;
         for (let i = 0; i < attrs.length; i++) {
-          const attrName = attrs[i].name;
-          const attrValue = attrs[i].value;
+          const attrName = attrs[i]!.name;
+          const attrValue = attrs[i]!.value;
           if (attrName.startsWith("block-handler-")) {
             const idx = parseInt(attrName.slice(14), 10);
             info.push({
@@ -211,7 +211,7 @@ function buildTree(
               idx: parseInt(attrValue, 10),
             });
           } else {
-            el.setAttribute(attrs[i].name, attrValue);
+            el.setAttribute(attrs[i]!.name, attrValue);
           }
         }
       }
@@ -227,7 +227,7 @@ function buildTree(
       };
 
       if (node.firstChild) {
-        const childNode = node.childNodes[0];
+        const childNode = node.childNodes[0]!;
         if (
           node.childNodes.length === 1 &&
           childNode.nodeType === Node.ELEMENT_NODE &&
@@ -566,15 +566,15 @@ function createBlockClass(template: HTMLElement, ctx: BlockCtx): BlockClass {
       this.refs = refs;
       refs[0] = el;
       for (let i = 0; i < colN; i++) {
-        const packed = colPacked[i];
-        refs[packed & 0x7fff] = GETTERS[(packed >> 30) & 1].call(refs[(packed >> 15) & 0x7fff])!;
+        const packed = colPacked[i]!;
+        refs[packed & 0x7fff] = GETTERS[(packed >> 30) & 1]!.call(refs[(packed >> 15) & 0x7fff]!)!;
       }
 
       // applying data to all update points
       if (locN) {
         const data = this.data!;
         for (let i = 0; i < locN; i++) {
-          locSetters[i].call(refs[locRefIdxs[i]], data[i]);
+          locSetters[i]!.call(refs[locRefIdxs[i]!], data[i]);
         }
       }
 
@@ -584,9 +584,9 @@ function createBlockClass(template: HTMLElement, ctx: BlockCtx): BlockClass {
         for (let i = 0; i < childN; i++) {
           const child = children![i];
           if (child) {
-            const info = childInfos[i];
+            const info = childInfos[i]!;
             const afterRefIdx = (info >> 16) & 0x7fff;
-            const afterNode = afterRefIdx ? refs[afterRefIdx] : null;
+            const afterNode = afterRefIdx ? refs[afterRefIdx]! : null;
             child.isOnlyChild = !!(info & (1 << 15));
             child.mount(refs[info & 0x7fff] as any, afterNode);
           }
@@ -602,7 +602,7 @@ function createBlockClass(template: HTMLElement, ctx: BlockCtx): BlockClass {
         const refs = this.refs!;
         for (let cbRef of cbRefs) {
           const fn = data[cbRef];
-          fn(refs[locRefIdxs[cbRef]], null);
+          fn(refs[locRefIdxs[cbRef]!], null);
         }
       }
     };
@@ -620,7 +620,7 @@ function createBlockClass(template: HTMLElement, ctx: BlockCtx): BlockClass {
           const val1 = data1[i];
           const val2 = data2[i];
           if (val1 !== val2) {
-            locUpdaters[i].call(refs[locRefIdxs[i]], val2, val1);
+            locUpdaters[i]!.call(refs[locRefIdxs[i]!], val2, val1);
           }
         }
         this.data = data2;
@@ -644,9 +644,9 @@ function createBlockClass(template: HTMLElement, ctx: BlockCtx): BlockClass {
               children1![i] = undefined;
             }
           } else if (child2) {
-            const info = childInfos[i];
+            const info = childInfos[i]!;
             const afterRefIdx = (info >> 16) & 0x7fff;
-            const afterNode = afterRefIdx ? refs[afterRefIdx] : null;
+            const afterNode = afterRefIdx ? refs[afterRefIdx]! : null;
             child2.mount(refs[info & 0x7fff] as any, afterNode);
             children1![i] = child2;
           }
@@ -660,7 +660,7 @@ function createBlockClass(template: HTMLElement, ctx: BlockCtx): BlockClass {
         const refs = this.refs!;
         for (let cbRef of cbRefs) {
           const fn = data[cbRef];
-          fn(null, refs[locRefIdxs[cbRef]]);
+          fn(null, refs[locRefIdxs[cbRef]!]);
         }
       }
 
diff --git a/packages/owl/src/runtime/blockdom/event_catcher.ts b/packages/owl/src/runtime/blockdom/event_catcher.ts
index b51577d74..89ba132d5 100644
--- a/packages/owl/src/runtime/blockdom/event_catcher.ts
+++ b/packages/owl/src/runtime/blockdom/event_catcher.ts
@@ -28,10 +28,10 @@ export function createCatcher(eventsSpec: EventsSpec): Catcher {
       parent.insertBefore(this.afterNode, afterNode);
       this.wrapHandlerData();
       for (let name in eventsSpec) {
-        const index = eventsSpec[name];
+        const index = eventsSpec[name]!;
         const handler = createEventHandler(name);
         this.handlerFns[index] = handler;
-        handler.setup.call(parent, this.handlerData[index]);
+        handler.setup.call(parent, this.handlerData[index]!);
       }
     }
 
diff --git a/packages/owl/src/runtime/blockdom/events.ts b/packages/owl/src/runtime/blockdom/events.ts
index 0edb641b0..d419dbb80 100644
--- a/packages/owl/src/runtime/blockdom/events.ts
+++ b/packages/owl/src/runtime/blockdom/events.ts
@@ -10,13 +10,13 @@ interface EventHandlerCreator {
 }
 
 export function createEventHandler(rawEvent: string): EventHandlerCreator {
-  const eventName = rawEvent.split(".")[0];
+  const eventName = rawEvent.split(".")[0]!;
   const capture = rawEvent.includes(".capture");
   const passive = rawEvent.includes(".passive");
   if (rawEvent.includes(".synthetic")) {
     return createSyntheticHandler(eventName, capture, passive);
   } else {
-    return createElementHandler(eventName, capture, passive);
+    return createElementHandler(eventName!, capture, passive);
   }
 }
 
diff --git a/packages/owl/src/runtime/blockdom/html.ts b/packages/owl/src/runtime/blockdom/html.ts
index 429b2986d..ec4d74cdd 100644
--- a/packages/owl/src/runtime/blockdom/html.ts
+++ b/packages/owl/src/runtime/blockdom/html.ts
@@ -40,7 +40,7 @@ class VHtml {
   }
 
   moveBeforeVNode(other: VHtml | null, afterNode: Node | null) {
-    const target = other ? other.content[0] : afterNode;
+    const target = other ? other.content[0]! : afterNode;
     this.moveBeforeDOMNode(target);
   }
 
@@ -52,7 +52,7 @@ class VHtml {
     if (this.html !== html2) {
       const parent = this.parentEl;
       // insert new html in front of current
-      const afterNode = this.content[0];
+      const afterNode = this.content[0]!;
       const template = document.createElement("template");
       template.innerHTML = html2;
       const content = [...(template.content.childNodes as any)];
diff --git a/packages/owl/src/runtime/blockdom/list.ts b/packages/owl/src/runtime/blockdom/list.ts
index f26fa867c..a07b4b327 100644
--- a/packages/owl/src/runtime/blockdom/list.ts
+++ b/packages/owl/src/runtime/blockdom/list.ts
@@ -1,6 +1,6 @@
 import type { VNode } from "./index";
 
-const getDescriptor = (o: any, p: any) => Object.getOwnPropertyDescriptor(o, p)!;
+const getDescriptor = (o: object, p: string) => Object.getOwnPropertyDescriptor(o, p)!;
 let nodeInsertBefore: typeof Node.prototype.insertBefore;
 let nodeAppendChild: typeof Node.prototype.appendChild;
 let nodeRemoveChild: typeof Node.prototype.removeChild;
@@ -34,7 +34,7 @@ class VList {
     nodeInsertBefore.call(parent, _anchor, afterNode);
     const l = children.length;
     if (l) {
-      const mount = children[0].mount;
+      const mount = children[0]!.mount;
       for (let i = 0; i < l; i++) {
         mount.call(children[i], parent, _anchor);
       }
@@ -47,7 +47,7 @@ class VList {
     this.parentEl = parent;
     const children = this.children;
     for (let i = 0, l = children.length; i < l; i++) {
-      children[i].moveBeforeDOMNode(node, parent);
+      children[i]!.moveBeforeDOMNode(node, parent);
     }
     parent!.insertBefore(this.anchor!, node);
   }
@@ -59,7 +59,7 @@ class VList {
     }
     const children = this.children;
     for (let i = 0, l = children.length; i < l; i++) {
-      children[i].moveBeforeVNode(null, afterNode);
+      children[i]!.moveBeforeVNode(null, afterNode);
     }
     this.parentEl!.insertBefore(this.anchor!, afterNode);
   }
@@ -74,7 +74,7 @@ class VList {
       return;
     }
     this.children = ch2;
-    const proto = ch2[0] || ch1[0];
+    const proto = (ch2[0] || ch1[0])!;
     const {
       mount: cMount,
       patch: cPatch,
@@ -110,7 +110,7 @@ class VList {
     let endVn1 = ch1[endIdx1];
     let endVn2 = ch2[endIdx2];
 
-    let mapping: any = undefined;
+    let mapping: Record<string, number> | undefined = undefined;
 
     while (startIdx1 <= endIdx1 && startIdx2 <= endIdx2) {
       // -------------------------------------------------------------------
@@ -124,21 +124,21 @@ class VList {
         continue;
       }
       // -------------------------------------------------------------------
-      let startKey1 = startVn1.key;
-      let startKey2 = startVn2.key;
+      let startKey1 = startVn1!.key;
+      let startKey2 = startVn2!.key;
       if (startKey1 === startKey2) {
         cPatch.call(startVn1, startVn2, withBeforeRemove);
-        ch2[startIdx2] = startVn1;
+        ch2[startIdx2] = startVn1!;
         startVn1 = ch1[++startIdx1];
         startVn2 = ch2[++startIdx2];
         continue;
       }
       // -------------------------------------------------------------------
-      let endKey1 = endVn1.key;
-      let endKey2 = endVn2.key;
+      let endKey1 = endVn1!.key;
+      let endKey2 = endVn2!.key;
       if (endKey1 === endKey2) {
         cPatch.call(endVn1, endVn2, withBeforeRemove);
-        ch2[endIdx2] = endVn1;
+        ch2[endIdx2] = endVn1!;
         endVn1 = ch1[--endIdx1];
         endVn2 = ch2[--endIdx2];
         continue;
@@ -147,7 +147,7 @@ class VList {
       if (startKey1 === endKey2) {
         // bnode moved right
         cPatch.call(startVn1, endVn2, withBeforeRemove);
-        ch2[endIdx2] = startVn1;
+        ch2[endIdx2] = startVn1!;
         const nextChild = ch2[endIdx2 + 1];
         cMoveBefore.call(startVn1, nextChild, _anchor);
         startVn1 = ch1[++startIdx1];
@@ -158,7 +158,7 @@ class VList {
       if (endKey1 === startKey2) {
         // bnode moved left
         cPatch.call(endVn1, startVn2, withBeforeRemove);
-        ch2[startIdx2] = endVn1;
+        ch2[startIdx2] = endVn1!;
         const nextChild = ch1[startIdx1];
         cMoveBefore.call(endVn1, nextChild, _anchor);
         endVn1 = ch1[--endIdx1];
@@ -171,7 +171,7 @@ class VList {
       if (idxInOld === undefined) {
         cMount.call(startVn2, parent, cFirstNode.call(startVn1) || null);
       } else {
-        const elmToMove = ch1[idxInOld];
+        const elmToMove = ch1[idxInOld]!;
         cMoveBefore.call(elmToMove, startVn1, null);
         cPatch.call(elmToMove, startVn2, withBeforeRemove);
         ch2[startIdx2] = elmToMove;
@@ -205,7 +205,7 @@ class VList {
     const children = this.children;
     const l = children.length;
     if (l) {
-      const beforeRemove = children[0].beforeRemove;
+      const beforeRemove = children[0]!.beforeRemove;
       for (let i = 0; i < l; i++) {
         beforeRemove.call(children[i]);
       }
@@ -220,7 +220,7 @@ class VList {
       const children = this.children;
       const l = children.length;
       if (l) {
-        const remove = children[0].remove;
+        const remove = children[0]!.remove;
         for (let i = 0; i < l; i++) {
           remove.call(children[i]);
         }
@@ -243,10 +243,10 @@ export function list(children: VNode[]): VNode<VList> {
   return new VList(children);
 }
 
-function createMapping(ch1: any[], startIdx1: number, endIdx2: number): { [key: string]: any } {
-  let mapping: any = {};
+function createMapping(ch1: (VNode | null)[], startIdx1: number, endIdx2: number): Record<string, number> {
+  let mapping: Record<string, number> = {};
   for (let i = startIdx1; i <= endIdx2; i++) {
-    mapping[ch1[i].key] = i;
+    mapping[ch1[i]!.key] = i;
   }
   return mapping;
 }
diff --git a/packages/owl/src/runtime/blockdom/multi.ts b/packages/owl/src/runtime/blockdom/multi.ts
index 2c53eb80f..6bc688993 100644
--- a/packages/owl/src/runtime/blockdom/multi.ts
+++ b/packages/owl/src/runtime/blockdom/multi.ts
@@ -52,7 +52,7 @@ export class VMulti {
       if (child) {
         child.moveBeforeDOMNode(node, parent);
       } else {
-        const anchor = anchors![i];
+        const anchor = anchors![i]!;
         nodeInsertBefore.call(parent, anchor, node);
       }
     }
@@ -61,7 +61,7 @@ export class VMulti {
   moveBeforeVNode(other: VMulti | null, afterNode: Node | null) {
     if (other) {
       const next = other!.children[0];
-      afterNode = (next ? next.firstNode() : other!.anchors![0]) || null;
+      afterNode = (next ? next.firstNode() : other!.anchors![0]!) || null;
     }
     const children = this.children;
     const parent = this.parentEl;
@@ -71,7 +71,7 @@ export class VMulti {
       if (child) {
         child.moveBeforeVNode(null, afterNode);
       } else {
-        const anchor = anchors![i];
+        const anchor = anchors![i]!;
         nodeInsertBefore.call(parent, anchor, afterNode);
       }
     }
@@ -104,7 +104,7 @@ export class VMulti {
         }
       } else if (vn2) {
         children1[i] = vn2;
-        const anchor = anchors[i];
+        const anchor = anchors[i]!;
         vn2.mount(parentEl, anchor);
         nodeRemoveChild.call(parentEl, anchor);
       }
@@ -133,7 +133,7 @@ export class VMulti {
         if (child) {
           child.remove();
         } else {
-          nodeRemoveChild.call(parentEl, anchors![i]);
+          nodeRemoveChild.call(parentEl, anchors![i]!);
         }
       }
     }
diff --git a/packages/owl/src/runtime/component_node.ts b/packages/owl/src/runtime/component_node.ts
index 2d792beb2..09da446e9 100644
--- a/packages/owl/src/runtime/component_node.ts
+++ b/packages/owl/src/runtime/component_node.ts
@@ -164,7 +164,7 @@ export class ComponentNode implements VNode<ComponentNode> {
     this.status = STATUS.CANCELLED;
     const children = this.children;
     for (let childKey in children) {
-      children[childKey]._cancel();
+      children[childKey]!._cancel();
     }
   }
 
@@ -184,7 +184,7 @@ export class ComponentNode implements VNode<ComponentNode> {
       }
     }
     for (let childKey in this.children) {
-      this.children[childKey]._destroy();
+      this.children[childKey]!._destroy();
     }
     if (this.willDestroy.length) {
       try {
@@ -247,7 +247,7 @@ export class ComponentNode implements VNode<ComponentNode> {
       // If the error was handled by some child component, we need to find it to
       // apply its change
       for (let k in this.children) {
-        const child = this.children[k];
+        const child = this.children[k]!;
         child.updateDom();
       }
     } else {
diff --git a/packages/owl/src/runtime/lifecycle_hooks.ts b/packages/owl/src/runtime/lifecycle_hooks.ts
index 558facb82..f60ddba9b 100644
--- a/packages/owl/src/runtime/lifecycle_hooks.ts
+++ b/packages/owl/src/runtime/lifecycle_hooks.ts
@@ -23,37 +23,37 @@ function decorate(node: ComponentNode, f: Function, hookName: string) {
   return f.bind(node.component);
 }
 
-export function onWillStart(fn: () => Promise<void> | void | any) {
+export function onWillStart(fn: () => void | Promise<void>) {
   const { node } = getContext("component");
   node.willStart.push(decorate(node, fn, "onWillStart"));
 }
 
-export function onWillUpdateProps(fn: (nextProps: any) => Promise<void> | void | any) {
+export function onWillUpdateProps(fn: (nextProps: Record<string, any>) => void | Promise<void>) {
   const { node } = getContext("component");
   node.willUpdateProps.push(decorate(node, fn, "onWillUpdateProps"));
 }
 
-export function onMounted(fn: () => void | any) {
+export function onMounted(fn: () => void) {
   const { node } = getContext("component");
   node.mounted.push(decorate(node, fn, "onMounted"));
 }
 
-export function onWillPatch(fn: () => any | void) {
+export function onWillPatch(fn: () => void) {
   const { node } = getContext("component");
   node.willPatch.unshift(decorate(node, fn, "onWillPatch"));
 }
 
-export function onPatched(fn: () => void | any) {
+export function onPatched(fn: () => void) {
   const { node } = getContext("component");
   node.patched.push(decorate(node, fn, "onPatched"));
 }
 
-export function onWillUnmount(fn: () => void | any) {
+export function onWillUnmount(fn: () => void) {
   const { node } = getContext("component");
   node.willUnmount.unshift(decorate(node, fn, "onWillUnmount"));
 }
 
-export function onWillDestroy(fn: () => void | any) {
+export function onWillDestroy(fn: () => void) {
   const context = getContext();
   if (context.type === "component") {
     context.node.willDestroy.unshift(decorate(context.node, fn, "onWillDestroy"));
@@ -62,7 +62,7 @@ export function onWillDestroy(fn: () => void | any) {
   }
 }
 
-type OnErrorCallback = (error: any) => void | any;
+type OnErrorCallback = (error: unknown) => void;
 export function onError(callback: OnErrorCallback) {
   const { node } = getContext("component");
   let handlers = nodeErrorHandlers.get(node);
diff --git a/packages/owl/src/runtime/reactivity/computations.ts b/packages/owl/src/runtime/reactivity/computations.ts
index 6071009dd..3e9b254a0 100644
--- a/packages/owl/src/runtime/reactivity/computations.ts
+++ b/packages/owl/src/runtime/reactivity/computations.ts
@@ -73,7 +73,7 @@ export function onWriteAtom(atom: Atom) {
 const batchProcessEffects = batched(processEffects);
 function processEffects() {
   for (let i = 0; i < observers.length; i++) {
-    updateComputation(observers[i]);
+    updateComputation(observers[i]!);
   }
   observers.length = 0;
 }
diff --git a/packages/owl/src/runtime/registry.ts b/packages/owl/src/runtime/registry.ts
index 7cc00e541..a7b4c2f4f 100644
--- a/packages/owl/src/runtime/registry.ts
+++ b/packages/owl/src/runtime/registry.ts
@@ -48,7 +48,7 @@ export class Registry<T> {
     if (!hasKey && arguments.length < 2) {
       throw new Error(`KeyNotFoundError: Cannot find key "${key}" (registry '${this._name}')`);
     }
-    return hasKey ? this._map()[key][1] : defaultValue!;
+    return hasKey ? this._map()[key]![1] : defaultValue!;
   }
 
   delete(key: string) {
diff --git a/packages/owl/src/runtime/rendering/error_handling.ts b/packages/owl/src/runtime/rendering/error_handling.ts
index 9fd31df47..7d2e03d26 100644
--- a/packages/owl/src/runtime/rendering/error_handling.ts
+++ b/packages/owl/src/runtime/rendering/error_handling.ts
@@ -52,7 +52,7 @@ export function handleError(params: ErrorParams) {
       // execute in the opposite order
       for (let i = errorHandlers.length - 1; i >= 0; i--) {
         try {
-          errorHandlers[i](error, finalize);
+          errorHandlers[i]!(error, finalize);
           return; // handled
         } catch (e) {
           error = e;
diff --git a/packages/owl/src/runtime/rendering/fibers.ts b/packages/owl/src/runtime/rendering/fibers.ts
index 9d817d23f..90e99f343 100644
--- a/packages/owl/src/runtime/rendering/fibers.ts
+++ b/packages/owl/src/runtime/rendering/fibers.ts
@@ -103,7 +103,7 @@ export class Fiber {
       this.root = root;
       parent.children.push(this);
     } else {
-      this.root = this as any;
+      this.root = this as unknown as RootFiber;
     }
   }
 
diff --git a/packages/owl/src/runtime/template_set.ts b/packages/owl/src/runtime/template_set.ts
index 3ba17a277..e7da08f2a 100644
--- a/packages/owl/src/runtime/template_set.ts
+++ b/packages/owl/src/runtime/template_set.ts
@@ -40,7 +40,7 @@ export class TemplateSet {
         this.addTemplates(config.templates);
       } else {
         for (const name in config.templates) {
-          this.addTemplate(name, config.templates[name]);
+          this.addTemplate(name, config.templates[name]!);
         }
       }
     }
@@ -56,7 +56,7 @@ export class TemplateSet {
       if (!this.dev) {
         return;
       }
-      const rawTemplate = this.rawTemplates[name];
+      const rawTemplate = this.rawTemplates[name]!;
       const currentAsString =
         typeof rawTemplate === "string"
           ? rawTemplate
@@ -102,12 +102,12 @@ export class TemplateSet {
       // recursive call to the template name
       const templates = this.templates;
       this.templates[cacheKey] = function (context, parent) {
-        return templates[cacheKey].call(this, context, parent);
+        return templates[cacheKey]!.call(this, context, parent);
       };
       const template = templateFn(this, bdom, this.runtimeUtils);
       this.templates[cacheKey] = template;
     }
-    return this.templates[cacheKey];
+    return this.templates[cacheKey]!;
   }
 
   private _compileTemplate(name: string, template: string | Element): ReturnType<typeof compile> {
diff --git a/packages/owl/src/runtime/utils.ts b/packages/owl/src/runtime/utils.ts
index 4e576dd6d..a1e203aff 100644
--- a/packages/owl/src/runtime/utils.ts
+++ b/packages/owl/src/runtime/utils.ts
@@ -87,7 +87,7 @@ export class EventBus extends EventTarget {
   }
 }
 
-export function whenReady(fn?: any): Promise<void> {
+export function whenReady(fn?: () => void): Promise<void> {
   return new Promise(function (resolve) {
     if (document.readyState !== "loading") {
       resolve(true);
@@ -104,7 +104,7 @@ export function whenReady(fn?: any): Promise<void> {
  */
 export class Markup extends String {}
 
-export function htmlEscape(str: any): Markup {
+export function htmlEscape(str: unknown): Markup {
   if (str instanceof Markup) {
     return str;
   }
@@ -114,6 +114,7 @@ export function htmlEscape(str: any): Markup {
   if (typeof str === "number") {
     return markup(String(str));
   }
+  let result = String(str);
   [
     ["&", "&amp;"],
     ["<", "&lt;"],
@@ -122,9 +123,9 @@ export function htmlEscape(str: any): Markup {
     ['"', "&quot;"],
     ["`", "&#x60;"],
   ].forEach((pairs) => {
-    str = String(str).replace(new RegExp(pairs[0], "g"), pairs[1]);
+    result = result.replace(new RegExp(pairs[0]!, "g"), pairs[1]!);
   });
-  return markup(str);
+  return markup(result);
 }
 
 /*
diff --git a/packages/owl/tests/blockdom/block_event_handling.test.ts b/packages/owl/tests/blockdom/block_event_handling.test.ts
index 01bad322c..e83236acc 100644
--- a/packages/owl/tests/blockdom/block_event_handling.test.ts
+++ b/packages/owl/tests/blockdom/block_event_handling.test.ts
@@ -206,7 +206,7 @@ test("synthetic and native handlers can cohabitate (3)", async () => {
   mount(tree, fixture);
   expect(fixture.innerHTML).toBe("<div><div></div><div></div></div>");
 
-  const children = fixture.children[0].children;
+  const children = fixture.children[0]!.children;
 
   (children[0] as HTMLElement).click();
   expect(steps).toEqual(["1", "0"]);
@@ -230,7 +230,7 @@ test("synthetic and native handlers can cohabitate (4)", async () => {
   mount(tree, fixture);
   expect(fixture.innerHTML).toBe("<div><div></div><div></div></div>");
 
-  const children = fixture.children[0].children;
+  const children = fixture.children[0]!.children;
 
   (children[0] as HTMLElement).click();
   expect(steps).toEqual(["1", "0"]);
diff --git a/packages/owl/tests/compiler/event_handling.test.ts b/packages/owl/tests/compiler/event_handling.test.ts
index 3a7a8db85..594c1cc84 100644
--- a/packages/owl/tests/compiler/event_handling.test.ts
+++ b/packages/owl/tests/compiler/event_handling.test.ts
@@ -331,7 +331,7 @@ describe("t-on", () => {
       };
       const node = mountToFixture(template, owner);
       const div = node.querySelector(".myClass");
-      const button = (<HTMLElement>node).getElementsByTagName("button")[0];
+      const button = (<HTMLElement>node).getElementsByTagName("button")[0]!;
       button.click();
       expect(steps).toEqual(["btnClicked", "divClicked"]);
     });
@@ -362,9 +362,9 @@ describe("t-on", () => {
       const node = mountToFixture(template, owner);
 
       const buttons = (<HTMLElement>node).getElementsByTagName("button");
-      buttons[0].click();
-      buttons[1].click();
-      buttons[2].click();
+      buttons[0]!.click();
+      buttons[1]!.click();
+      buttons[2]!.click();
     });
 
     test("t-on with self modifier", async () => {
@@ -386,10 +386,10 @@ describe("t-on", () => {
 
       const buttons = (<HTMLElement>node).getElementsByTagName("button");
       const spans = (<HTMLElement>node).getElementsByTagName("span");
-      spans[0].click();
-      spans[1].click();
-      buttons[0].click();
-      buttons[1].click();
+      spans[0]!.click();
+      spans[1]!.click();
+      buttons[0]!.click();
+      buttons[1]!.click();
 
       expect(steps).toEqual(["onClick", "onClick", "onClickSelf"]);
     });
@@ -408,8 +408,8 @@ describe("t-on", () => {
         steps.push(e.defaultPrevented);
       });
 
-      const button = (<HTMLElement>node).getElementsByTagName("button")[0];
-      const span = (<HTMLElement>node).getElementsByTagName("span")[0];
+      const button = (<HTMLElement>node).getElementsByTagName("button")[0]!;
+      const span = (<HTMLElement>node).getElementsByTagName("span")[0]!;
       span.click();
       button.click();
 
@@ -430,8 +430,8 @@ describe("t-on", () => {
         steps.push(e.defaultPrevented);
       });
 
-      const button = (<HTMLElement>node).getElementsByTagName("button")[0];
-      const span = (<HTMLElement>node).getElementsByTagName("span")[0];
+      const button = (<HTMLElement>node).getElementsByTagName("button")[0]!;
+      const span = (<HTMLElement>node).getElementsByTagName("span")[0]!;
       span.click();
       button.click();
 
@@ -465,9 +465,9 @@ describe("t-on", () => {
         `<div><a href="#"> Edit Project 1</a><a href="#"> Edit Project 2</a></div>`
       );
 
-      const links = node.querySelectorAll("a")!;
-      links[0].click();
-      links[1].click();
+      const links = node.querySelectorAll("a");
+      links[0]!.click();
+      links[1]!.click();
 
       expect(steps).toEqual([1, 2]);
     });
@@ -483,7 +483,7 @@ describe("t-on", () => {
         expect(e.defaultPrevented).toBe(true);
       });
 
-      const button = (<HTMLElement>node).getElementsByTagName("button")[0];
+      const button = (<HTMLElement>node).getElementsByTagName("button")[0]!;
       button.click();
     });
 
@@ -531,7 +531,7 @@ describe("t-on", () => {
       };
       const node = mountToFixture(template, owner);
 
-      const button = (<HTMLElement>node).getElementsByTagName("button")[0];
+      const button = (<HTMLElement>node).getElementsByTagName("button")[0]!;
       button.click();
       expect(steps).toEqual(["captured", "normal"]);
     });
@@ -588,7 +588,7 @@ describe("t-on", () => {
         },
       };
       const node = mountToFixture(template, owner);
-      const button = (<HTMLElement>node).getElementsByTagName("button")[0];
+      const button = (<HTMLElement>node).getElementsByTagName("button")[0]!;
       button.click();
       expect(steps).toEqual(["btnClicked", "divClicked"]);
     });
diff --git a/packages/owl/tests/components/basics.test.ts b/packages/owl/tests/components/basics.test.ts
index cc7b268bb..d721cce62 100644
--- a/packages/owl/tests/components/basics.test.ts
+++ b/packages/owl/tests/components/basics.test.ts
@@ -431,7 +431,7 @@ describe("basics", () => {
 
     await mount(Counter, fixture);
     expect(fixture.innerHTML).toBe("<div>0<button>Inc</button></div>");
-    const button = fixture.getElementsByTagName("button")[0];
+    const button = fixture.getElementsByTagName("button")[0]!;
     button.click();
     await nextTick();
     expect(fixture.innerHTML).toBe("<div>1<button>Inc</button></div>");
@@ -451,7 +451,7 @@ describe("basics", () => {
       static components = { Counter };
     }
     const parent = await mount(Parent, fixture);
-    const button = fixture.getElementsByTagName("button")[0];
+    const button = fixture.getElementsByTagName("button")[0]!;
     button.click();
     await nextTick();
     expect(fixture.innerHTML).toBe("<div>1<button>Inc</button></div>");
@@ -752,12 +752,12 @@ describe("basics", () => {
       state = proxy({ flag: false });
     }
     const parent = await mount(Parent, fixture);
-    const child = Object.values(parent.__owl__.children)[0].component as any;
+    const child = Object.values(parent.__owl__.children)[0]!.component as any;
     expect(fixture.innerHTML).toBe(`<div><h2>noo</h2><span><span>child</span></span></div>`);
 
     parent.state.flag = true;
     await nextTick();
-    expect(Object.values(parent.__owl__.children)[0].component).toBe(child);
+    expect(Object.values(parent.__owl__.children)[0]!.component).toBe(child);
     expect(status(child)).toBe("mounted");
     expect(fixture.innerHTML).toBe(
       `<div><h1>hey</h1><span><span>child</span></span><span>test</span></div>`
diff --git a/packages/owl/tests/components/concurrency.test.ts b/packages/owl/tests/components/concurrency.test.ts
index 050dd1b8c..441c6f52c 100644
--- a/packages/owl/tests/components/concurrency.test.ts
+++ b/packages/owl/tests/components/concurrency.test.ts
@@ -522,9 +522,9 @@ test("update a sub-component twice in the same frame", async () => {
     ]
   `);
 
-  defs[0].resolve();
+  defs[0]!.resolve();
   await Promise.resolve();
-  defs[1].resolve();
+  defs[1]!.resolve();
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><span>3</span></div>");
   expect(steps.splice(0)).toMatchInlineSnapshot(`
@@ -917,7 +917,7 @@ test("concurrent renderings scenario 2", async () => {
     ]
   `);
 
-  defs[1].resolve(); // resolve rendering initiated in B
+  defs[1]!.resolve(); // resolve rendering initiated in B
   await nextTick();
   expect(fixture.innerHTML).toBe("<div>2<p><span>2c</span></p></div>");
   expect(steps.splice(0)).toMatchInlineSnapshot(`
@@ -931,7 +931,7 @@ test("concurrent renderings scenario 2", async () => {
     ]
   `);
 
-  defs[0].resolve(); // resolve rendering initiated in A
+  defs[0]!.resolve(); // resolve rendering initiated in A
   await nextTick();
   expect(fixture.innerHTML).toBe("<div>2<p><span>2c</span></p></div>");
   expect(steps.splice(0)).toMatchInlineSnapshot(`[]`);
@@ -1008,12 +1008,12 @@ test("concurrent renderings scenario 2bis", async () => {
     ]
   `);
 
-  defs[0].resolve(); // resolve rendering initiated in A
+  defs[0]!.resolve(); // resolve rendering initiated in A
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p><span>1b</span></p></div>"); // TODO: is this what we want?? 2b could be ok too
   expect(steps.splice(0)).toMatchInlineSnapshot(`[]`);
 
-  defs[1].resolve(); // resolve rendering initiated in B
+  defs[1]!.resolve(); // resolve rendering initiated in B
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p><span>2c</span></p></div>");
   expect(steps.splice(0)).toMatchInlineSnapshot(`
@@ -1124,7 +1124,7 @@ test("concurrent renderings scenario 3", async () => {
     ]
   `);
 
-  defsD[0].resolve(); // resolve rendering initiated in C (should be ignored)
+  defsD[0]!.resolve(); // resolve rendering initiated in C (should be ignored)
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p><span><i>2d</i></span></p></div>");
   expect(steps.splice(0)).toMatchInlineSnapshot(`
@@ -1237,13 +1237,13 @@ test("concurrent renderings scenario 4", async () => {
     ]
   `);
 
-  defsD[1].resolve(); // completely resolve rendering initiated in A
+  defsD[1]!.resolve(); // completely resolve rendering initiated in A
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p><span><i>1c</i></span></p></div>");
   expect(ComponentD.prototype.someValue).toHaveBeenCalledTimes(1);
   expect(steps.splice(0)).toMatchInlineSnapshot(`[]`);
 
-  defsD[0].resolve(); // resolve rendering initiated in C (should be ignored)
+  defsD[0]!.resolve(); // resolve rendering initiated in C (should be ignored)
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p><span><i>2d</i></span></p></div>");
   expect(ComponentD.prototype.someValue).toHaveBeenCalledTimes(2);
@@ -1319,13 +1319,13 @@ test("concurrent renderings scenario 5", async () => {
     ]
   `);
 
-  defsB[0].resolve(); // resolve first re-rendering (should be ignored)
+  defsB[0]!.resolve(); // resolve first re-rendering (should be ignored)
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p>1</p></div>");
   expect(ComponentB.prototype.someValue).toHaveBeenCalledTimes(1);
   expect(steps.splice(0)).toMatchInlineSnapshot(`[]`);
 
-  defsB[1].resolve(); // resolve second re-rendering
+  defsB[1]!.resolve(); // resolve second re-rendering
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p>3</p></div>");
   expect(ComponentB.prototype.someValue).toHaveBeenCalledTimes(2);
@@ -1398,7 +1398,7 @@ test("concurrent renderings scenario 6", async () => {
     ]
   `);
 
-  defsB[1].resolve(); // resolve second re-rendering
+  defsB[1]!.resolve(); // resolve second re-rendering
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p>3</p></div>");
   expect(ComponentB.prototype.someValue).toHaveBeenCalledTimes(2);
@@ -1411,7 +1411,7 @@ test("concurrent renderings scenario 6", async () => {
     ]
   `);
 
-  defsB[0].resolve(); // resolve first re-rendering (should be ignored)
+  defsB[0]!.resolve(); // resolve first re-rendering (should be ignored)
   await nextTick();
   expect(fixture.innerHTML).toBe("<div><p>3</p></div>");
   expect(ComponentB.prototype.someValue).toHaveBeenCalledTimes(2);
diff --git a/packages/owl/tests/components/error_handling.test.ts b/packages/owl/tests/components/error_handling.test.ts
index 82d6cd0d2..64aa4fa35 100644
--- a/packages/owl/tests/components/error_handling.test.ts
+++ b/packages/owl/tests/components/error_handling.test.ts
@@ -360,7 +360,7 @@ describe("errors and promises", () => {
         onWillPatch(() => {
           throw new Error("boom");
         });
-        onError((e) => (error = e));
+        onError((e) => (error = e as Error));
       }
     }
 
@@ -382,7 +382,7 @@ describe("errors and promises", () => {
         onPatched(() => {
           throw new Error("boom");
         });
-        onError((e) => (error = e));
+        onError((e) => (error = e as Error));
       }
     }
 
@@ -423,7 +423,7 @@ describe("errors and promises", () => {
       static template = xml`<div><t t-if="this.flag" t-out="this.will.crash"/></div>`;
       flag = false;
       setup() {
-        onError((cause) => (error = cause));
+        onError((cause) => (error = cause as Error));
       }
     }
 
diff --git a/packages/owl/tests/components/event_handling.test.ts b/packages/owl/tests/components/event_handling.test.ts
index 7999fdf28..803fa6888 100644
--- a/packages/owl/tests/components/event_handling.test.ts
+++ b/packages/owl/tests/components/event_handling.test.ts
@@ -68,7 +68,7 @@ describe("event handling", () => {
     await mount(Counter, fixture);
     await nextTick();
     expect(fixture.innerHTML).toBe(`<div><input type="text"></div>`);
-    const input = fixture.getElementsByTagName("input")[0];
+    const input = fixture.getElementsByTagName("input")[0]!;
     input.value = "test";
     input.dispatchEvent(new Event("input"));
     await nextTick();
diff --git a/packages/owl/tests/components/hooks.test.ts b/packages/owl/tests/components/hooks.test.ts
index c3664088b..ccdc2adb0 100644
--- a/packages/owl/tests/components/hooks.test.ts
+++ b/packages/owl/tests/components/hooks.test.ts
@@ -326,7 +326,7 @@ describe("hooks", () => {
     await mount(MyComponent, fixture);
 
     expect(fixture.innerHTML).toBe("<span>0</span>");
-    const span = fixture.getElementsByTagName("span")[0];
+    const span = fixture.getElementsByTagName("span")[0]!;
     span.click();
     await nextTick();
     expect(fixture.innerHTML).toBe("<span>1</span>");
diff --git a/packages/owl/tests/components/props.test.ts b/packages/owl/tests/components/props.test.ts
index ff20aead2..455fa9b35 100644
--- a/packages/owl/tests/components/props.test.ts
+++ b/packages/owl/tests/components/props.test.ts
@@ -560,8 +560,8 @@ test("arrow function props re-render when captured variable changes", async () =
       useLogLifecycle(this);
     }
     toggle(id: number) {
-      const index = this.state.elems.findIndex((el) => el.id === id)!;
-      const todo = this.state.elems[index];
+      const index = this.state.elems.findIndex((el) => el.id === id);
+      const todo = this.state.elems[index]!;
       this.state.elems[index] = { ...todo, isChecked: !todo.isChecked };
     }
   }
diff --git a/packages/owl/tests/components/props_validation.test.ts b/packages/owl/tests/components/props_validation.test.ts
index 4465ba99d..89da08f96 100644
--- a/packages/owl/tests/components/props_validation.test.ts
+++ b/packages/owl/tests/components/props_validation.test.ts
@@ -679,7 +679,7 @@ describe("props validation", () => {
       static components = { SubComp };
       state: any = { p: 1 };
       setup() {
-        onError((e) => (error = e));
+        onError((e) => (error = e as Error));
       }
     }
     const parent = await mount(Parent, fixture, { dev: true });
diff --git a/packages/owl/tests/components/slots.test.ts b/packages/owl/tests/components/slots.test.ts
index 279c07892..b53c82a62 100644
--- a/packages/owl/tests/components/slots.test.ts
+++ b/packages/owl/tests/components/slots.test.ts
@@ -619,7 +619,7 @@ describe("slots", () => {
     );
 
     // test updateprops here
-    app.state.users[1].name = "Mathieu";
+    app.state.users[1]!.name = "Mathieu";
     await nextTick();
     expect(fixture.innerHTML).toBe(
       '<div><u><li><a href="/user/1">User Aaron</a></li><li><a href="/user/2">User Mathieu</a></li></u></div>'
@@ -659,7 +659,7 @@ describe("slots", () => {
     );
 
     // test updateprops here
-    app.state.users[1].name = "Mathieu";
+    app.state.users[1]!.name = "Mathieu";
     await nextTick();
     expect(fixture.innerHTML).toBe(
       '<div><u><li><a href="/user/1">User Aaron</a></li><li><a href="/user/2">User Mathieu</a></li></u></div>'
@@ -858,7 +858,7 @@ describe("slots", () => {
     expect(parentChildren.length).toBe(1);
     expect(parentChildren[0]).toBeInstanceOf(Child);
 
-    const childrenChildren = children(parentChildren[0]);
+    const childrenChildren = children(parentChildren[0]!);
     expect(childrenChildren.length).toBe(1);
     expect(childrenChildren[0]).toBeInstanceOf(GrandChild);
   });
@@ -896,7 +896,7 @@ describe("slots", () => {
     expect(parentChildren.length).toBe(1);
     expect(parentChildren[0]).toBeInstanceOf(Child);
 
-    const childrenChildren = children(parentChildren[0]);
+    const childrenChildren = children(parentChildren[0]!);
     expect(childrenChildren.length).toBe(1);
     expect(childrenChildren[0]).toBeInstanceOf(GrandChild);
   });
@@ -1039,10 +1039,10 @@ describe("slots", () => {
 
     expect(parent).toBeInstanceOf(UsingTcallInSlotted);
     expect(children(parent).length).toBe(1);
-    const slotted = children(parent)[0];
+    const slotted = children(parent)[0]!;
     expect(slotted).toBeInstanceOf(Slotted);
     expect(children(slotted).length).toBe(1);
-    const child = children(slotted)[0];
+    const child = children(slotted)[0]!;
     expect(child).toBeInstanceOf(Child);
 
     expect(fixture.innerHTML).toBe(
diff --git a/packages/owl/tests/components/t_component.test.ts b/packages/owl/tests/components/t_component.test.ts
index 1569408f9..6923d6230 100644
--- a/packages/owl/tests/components/t_component.test.ts
+++ b/packages/owl/tests/components/t_component.test.ts
@@ -188,7 +188,7 @@ describe("t-component", () => {
     }
     await mount(ParentWidget, fixture);
     expect(fixture.innerHTML).toBe("<div><div>0<button>Inc</button></div></div>");
-    const button = fixture.getElementsByTagName("button")[0];
+    const button = fixture.getElementsByTagName("button")[0]!;
     await button.click();
     await nextTick();
     expect(fixture.innerHTML).toBe("<div><div>1<button>Inc</button></div></div>");
diff --git a/packages/owl/tests/components/t_model.test.ts b/packages/owl/tests/components/t_model.test.ts
index 50ec25098..1b09209c7 100644
--- a/packages/owl/tests/components/t_model.test.ts
+++ b/packages/owl/tests/components/t_model.test.ts
@@ -167,7 +167,7 @@ describe("t-model directive", () => {
       '<div><input type="radio" id="one" value="One"><input type="radio" id="two" value="Two"><span>Choice: One</span></div>'
     );
 
-    const secondInput = fixture.querySelectorAll("input")[1];
+    const secondInput = fixture.querySelectorAll("input")[1]!;
     secondInput.click();
     await nextTick();
     expect(comp.choice()).toBe("Two");
@@ -190,7 +190,7 @@ describe("t-model directive", () => {
       '<div><input type="radio" id="one" value="One"><input type="radio" id="two" value="Two"></div>'
     );
 
-    const secondInput = fixture.querySelectorAll("input")[1];
+    const secondInput = fixture.querySelectorAll("input")[1]!;
     expect(secondInput.checked).toBe(true);
   });
 
@@ -410,9 +410,9 @@ describe("t-model directive", () => {
 
     const input = fixture.querySelectorAll("input")[1]!;
     input.click();
-    expect(comp.things[1].f()).toBe(true);
-    expect(comp.things[0].f()).toBe(false);
-    expect(comp.things[2].f()).toBe(false);
+    expect(comp.things[1]!.f()).toBe(true);
+    expect(comp.things[0]!.f()).toBe(false);
+    expect(comp.things[2]!.f()).toBe(false);
   });
 
   test("in a t-foreach, part 2", async () => {
@@ -565,7 +565,7 @@ describe("t-model directive", () => {
     expect(comp.choice()).toBe("");
     expect(comp.lastClicked()).toBe("");
 
-    const lastInput = fixture.querySelectorAll("input")[2];
+    const lastInput = fixture.querySelectorAll("input")[2]!;
     lastInput.click();
     await nextTick();
     expect(comp.choice()).toBe("Three");
@@ -682,7 +682,7 @@ describe("t-model directive", () => {
     expect(comp.value()).toBe(2);
 
     // emulate a click on the option=3 element
-    fixture.querySelectorAll("option")[2].selected = true;
+    fixture.querySelectorAll("option")[2]!.selected = true;
     fixture.querySelector("select")!.dispatchEvent(new Event("change"));
 
     await nextTick();
@@ -840,7 +840,7 @@ describe("t-model.proxy directive", () => {
       '<div><input type="radio" id="one" value="One"><input type="radio" id="two" value="Two"><span>Choice: </span></div>'
     );
 
-    const firstInput = fixture.querySelectorAll("input")[0];
+    const firstInput = fixture.querySelectorAll("input")[0]!;
     firstInput.click();
     await nextTick();
     expect(comp.state.choice).toBe("One");
diff --git a/packages/owl/tests/components/t_on.test.ts b/packages/owl/tests/components/t_on.test.ts
index 9cea9a14e..6cabee17e 100644
--- a/packages/owl/tests/components/t_on.test.ts
+++ b/packages/owl/tests/components/t_on.test.ts
@@ -85,8 +85,8 @@ describe("t-on", () => {
     );
     expect(comp.otherState.vals).toStrictEqual([]);
     const buttons = fixture.querySelectorAll("button");
-    buttons[0].click();
-    buttons[1].click();
+    buttons[0]!.click();
+    buttons[1]!.click();
     expect(comp.otherState.vals).toStrictEqual(["a", "b"]);
   });
 
@@ -111,8 +111,8 @@ describe("t-on", () => {
     );
     expect(comp.otherState.vals).toStrictEqual([]);
     const buttons = fixture.querySelectorAll("button");
-    buttons[0].click();
-    buttons[1].click();
+    buttons[0]!.click();
+    buttons[1]!.click();
     expect(comp.otherState.vals).toStrictEqual(["a_nova_0_1", "b_nova_0_1"]);
   });
 
@@ -138,8 +138,8 @@ describe("t-on", () => {
     );
     expect(comp.otherState.vals).toStrictEqual([]);
     const buttons = fixture.querySelectorAll("button");
-    buttons[0].click();
-    buttons[1].click();
+    buttons[0]!.click();
+    buttons[1]!.click();
     expect(comp.otherState.vals).toStrictEqual(["a", "b"]);
   });
 
@@ -163,8 +163,8 @@ describe("t-on", () => {
     );
     expect(comp.otherState.vals).toStrictEqual([]);
     const buttons = fixture.querySelectorAll("button");
-    buttons[0].click();
-    buttons[1].click();
+    buttons[0]!.click();
+    buttons[1]!.click();
     expect(comp.otherState.vals).toStrictEqual(["2_2", "2_2"]);
   });
 
@@ -370,15 +370,15 @@ describe("t-on", () => {
     await mount(Parent, fixture);
     expect(fixture.innerHTML).toBe("<div>John</div><div>Raoul</div><div>Gérald</div>");
     expect([]).toBeLogged();
-    fixture.querySelectorAll("div")[0].click();
+    fixture.querySelectorAll("div")[0]!.click();
     await nextTick();
     expect(["John"]).toBeLogged();
 
-    fixture.querySelectorAll("div")[1].click();
+    fixture.querySelectorAll("div")[1]!.click();
     await nextTick();
     expect(["Raoul"]).toBeLogged();
 
-    fixture.querySelectorAll("div")[2].click();
+    fixture.querySelectorAll("div")[2]!.click();
     await nextTick();
     expect(["Gérald"]).toBeLogged();
   });
@@ -404,7 +404,7 @@ describe("t-on", () => {
     expect(fixture.innerHTML).toBe("<div>aaron</div>");
     expect([]).toBeLogged();
 
-    fixture.querySelectorAll("div")[0].click();
+    fixture.querySelectorAll("div")[0]!.click();
     await nextTick();
     expect(["aaron"]).toBeLogged();
 
@@ -412,7 +412,7 @@ describe("t-on", () => {
     await nextTick();
     expect(fixture.innerHTML).toBe("<div>lucas</div>");
 
-    fixture.querySelectorAll("div")[0].click();
+    fixture.querySelectorAll("div")[0]!.click();
     await nextTick();
     expect(["lucas"]).toBeLogged();
   });
diff --git a/packages/owl/tests/helpers.ts b/packages/owl/tests/helpers.ts
index 95e020164..73d8d4fb4 100644
--- a/packages/owl/tests/helpers.ts
+++ b/packages/owl/tests/helpers.ts
@@ -211,7 +211,7 @@ export function useLogLifecycle(
 
 export function children(w: Component): Component[] {
   const childrenMap = w.__owl__.children;
-  return Object.keys(childrenMap).map((id) => childrenMap[id].component);
+  return Object.keys(childrenMap).map((id) => childrenMap[id]!.component);
 }
 
 export function isDirectChildOf(child: Component, parent: Component): boolean {
diff --git a/packages/owl/tests/reactivity/signals.test.ts b/packages/owl/tests/reactivity/signals.test.ts
index 023a6ddd3..032dc2fd8 100644
--- a/packages/owl/tests/reactivity/signals.test.ts
+++ b/packages/owl/tests/reactivity/signals.test.ts
@@ -85,11 +85,11 @@ describe("signal.Array", () => {
     const reactiveArray = signal.Array<{ value: number }>([obj]);
     expect(reactiveArray()[0]).toBe(obj);
 
-    const e = spyEffect(() => reactiveArray()[0].value);
+    const e = spyEffect(() => reactiveArray()[0]!.value);
     e();
     expectSpy(e.spy, 1);
 
-    reactiveArray()[0].value = 1;
+    reactiveArray()[0]!.value = 1;
     expectSpy(e.spy, 1, { result: 0 });
     expect(reactiveArray()[0]).toBe(obj);
 
diff --git a/tsconfig.base.json b/tsconfig.base.json
index d7e63939d..2b1fd695d 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -6,7 +6,7 @@
   "compilerOptions": {
                                                                 // Main options
     "target": "ES2022",
-    "module": "es6",
+    "module": "es2022",
     "lib": ["ES2022", "DOM", "DOM.Iterable"],
                                                                 // Strict typechecking options
     "strict": true,
@@ -16,8 +16,9 @@
     "noUnusedParameters": false,
     "noImplicitReturns": true,
     "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
                                                                 // Module resolution options
-    "moduleResolution": "node",
+    "moduleResolution": "bundler",
     "types": [
       "node"
     ],