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fix(javascript): separate erased types from runtime semantics
Record erasure during definition indexing and reuse it across runtime references, captures, effects, module links, routes, Electron and Vite. Preserve source type links and emitted decorator and computed-key effects; keep actual runtime reads and escapes conservative.
Validation: 1,647 focused tests and 9 documentation tests passed, with build, static and documentation gates. The inherited reference-lifetimes stress file exhausts a 512 MiB worker on both unmodified 18451e479 and this change; that file remains unverified. TypeScript 7.0.2 emit was inspected for ES2022 and ES2018 without executing emitted code.
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@@ -12,7 +12,7 @@ import {
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type JavaScriptSemanticAnalysisState,
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} from "./javascriptSemanticState.js";
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import { isUnmodifiedGlobalReference } from "./javascriptSemanticAmbientWrites.js";
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import { traverseJavaScriptAstSteps } from "./javascriptSemanticTraversal.js";
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import { traverseJavaScriptValueAstSteps } from "./javascriptSemanticTraversal.js";
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import { semanticPropertyPathKeyMatches } from "./javascriptSemanticPropertyPaths.js";
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import { createSemanticModuleInterop } from "./javascriptModuleInterop.js";
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import { evaluateSemanticExpression } from "./javascriptSemanticValues.js";
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@@ -441,154 +441,158 @@ export function* indexCommonJsExportReceiversSteps(
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if (exportsWrite) exportsIdentity = selected;
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};
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yield* traverseJavaScriptAstSteps(state.program, {
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enter: (node, parent) => {
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const outer = execution.at(-1) ?? "ordered";
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const mode: Execution =
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outer === "deferred" || t.isFunction(node) || t.isClass(node)
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? "deferred"
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: outer === "conditional" ||
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// Mark the whole operation: a later tree-visited RHS must not
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// restore certainty after an earlier tree-visited pattern write.
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hasDestructuringEvaluationOrder(node) ||
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t.isIfStatement(node) ||
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t.isSwitchStatement(node) ||
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t.isLoop(node) ||
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t.isTryStatement(node) ||
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t.isObjectPattern(node) ||
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t.isArrayPattern(node) ||
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(t.isLogicalExpression(parent) && parent.right === node) ||
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(t.isAssignmentPattern(parent) && parent.right === node) ||
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(t.isAssignmentExpression(parent) &&
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["&&=", "||=", "??="].includes(parent.operator) &&
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parent.right === node) ||
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t.isOptionalCallExpression(parent) ||
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(t.isOptionalMemberExpression(parent) &&
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parent.property === node) ||
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(t.isConditionalExpression(parent) && parent.test !== node)
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? "conditional"
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: "ordered";
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execution.push(mode);
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if (
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t.isAssignmentExpression(node) &&
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commonJsExportName(node.left, state) !== undefined &&
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!isCommonJsModuleExports(node.left, state)
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) {
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const receiver =
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t.isMemberExpression(node.left) ||
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t.isOptionalMemberExpression(node.left)
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? node.left.object
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: null;
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captures.set(
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node,
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mode !== "ordered"
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? null
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: receiver !== null &&
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isUnshadowedGlobal(receiver, state, "exports")
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? exportsIdentity
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: publicIdentity,
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);
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}
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const descriptor = commonJsDefinedExport(node, state);
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if (descriptor !== undefined) {
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const receiver = isUnshadowedGlobal(
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descriptor.receiver,
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state,
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"exports",
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)
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? exportsIdentity
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: publicIdentity;
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const names = describedFields.get(receiver) ?? new Set<string>();
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names.add(descriptor.exportedName);
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describedFields.set(receiver, names);
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}
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const defined = descriptor ?? commonJsAssignedExports(node, state);
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if (defined !== undefined && t.isCallExpression(node))
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captures.set(
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node,
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mode !== "ordered"
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? null
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: isUnshadowedGlobal(defined.receiver, state, "exports")
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? exportsIdentity
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: publicIdentity,
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);
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},
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exit: (node) => {
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const mode = execution.pop() ?? "conditional";
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if (publicCallWrites.has(node)) {
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if (mode === "deferred") deferredReplacement = true;
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else publicIdentity = null;
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}
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if (t.isAssignmentExpression(node)) {
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const left = unwrapJavaScriptExpression(node.left).node;
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const identity =
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node.operator === "=" &&
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(t.isIdentifier(left) ||
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t.isMemberExpression(left) ||
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t.isOptionalMemberExpression(left))
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? valueOf(node.right)
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: null;
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for (const target of semanticWriteTargets(node.left))
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write(target, identity, mode);
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values.set(node, identity);
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} else if (t.isVariableDeclarator(node) && node.init != null) {
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for (const target of semanticWriteTargets(node.id))
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write(
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target,
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t.isIdentifier(node.id) ? valueOf(node.init) : null,
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mode,
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yield* traverseJavaScriptValueAstSteps(
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state.program,
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state.erasedSyntaxNodes,
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{
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enter: (node, parent) => {
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const outer = execution.at(-1) ?? "ordered";
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const mode: Execution =
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outer === "deferred" || t.isFunction(node) || t.isClass(node)
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? "deferred"
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: outer === "conditional" ||
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// Mark the whole operation: a later tree-visited RHS must not
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// restore certainty after an earlier tree-visited pattern write.
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hasDestructuringEvaluationOrder(node) ||
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t.isIfStatement(node) ||
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t.isSwitchStatement(node) ||
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t.isLoop(node) ||
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t.isTryStatement(node) ||
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t.isObjectPattern(node) ||
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t.isArrayPattern(node) ||
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(t.isLogicalExpression(parent) && parent.right === node) ||
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(t.isAssignmentPattern(parent) && parent.right === node) ||
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(t.isAssignmentExpression(parent) &&
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["&&=", "||=", "??="].includes(parent.operator) &&
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parent.right === node) ||
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t.isOptionalCallExpression(parent) ||
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(t.isOptionalMemberExpression(parent) &&
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parent.property === node) ||
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(t.isConditionalExpression(parent) && parent.test !== node)
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? "conditional"
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: "ordered";
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execution.push(mode);
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if (
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t.isAssignmentExpression(node) &&
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commonJsExportName(node.left, state) !== undefined &&
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!isCommonJsModuleExports(node.left, state)
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) {
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const receiver =
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t.isMemberExpression(node.left) ||
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t.isOptionalMemberExpression(node.left)
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? node.left.object
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: null;
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captures.set(
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node,
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mode !== "ordered"
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? null
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: receiver !== null &&
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isUnshadowedGlobal(receiver, state, "exports")
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? exportsIdentity
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: publicIdentity,
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);
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} else if (t.isForOfStatement(node) || t.isForInStatement(node)) {
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if (!t.isVariableDeclaration(node.left))
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for (const target of semanticWriteTargets(node.left))
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write(target, null, mode);
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} else if (
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t.isUpdateExpression(node) ||
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t.isUnaryExpression(node, { operator: "delete" })
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) {
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if (t.isUnaryExpression(node, { operator: "delete" })) {
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const name = commonJsExportName(node.argument, state);
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if (
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name !== undefined &&
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!isCommonJsModuleExports(node.argument, state) &&
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(t.isMemberExpression(node.argument) ||
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t.isOptionalMemberExpression(node.argument))
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) {
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const receiver = isUnshadowedGlobal(
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node.argument.object,
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state,
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"exports",
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)
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? exportsIdentity
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: publicIdentity;
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const fields = deletions.get(receiver) ?? new Map();
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fields.set(name, {
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node,
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mode: name === "*" && mode === "ordered" ? "conditional" : mode,
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});
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deletions.set(receiver, fields);
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}
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}
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write(node.argument, null, mode);
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} else if (isUnshadowedGlobal(node, state, "exports")) {
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values.set(node, exportsIdentity);
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} else if (isCommonJsModuleExports(node, state)) {
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values.set(node, publicIdentity);
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} else if (
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t.isObjectExpression(node) ||
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t.isArrayExpression(node) ||
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t.isFunctionExpression(node) ||
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t.isArrowFunctionExpression(node) ||
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t.isClassExpression(node)
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) {
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values.set(node, node);
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fresh.add(node);
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} else if (t.isSequenceExpression(node)) {
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const last = node.expressions.at(-1);
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values.set(node, last === undefined ? null : valueOf(last));
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}
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const descriptor = commonJsDefinedExport(node, state);
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if (descriptor !== undefined) {
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const receiver = isUnshadowedGlobal(
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descriptor.receiver,
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state,
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"exports",
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)
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? exportsIdentity
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: publicIdentity;
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const names = describedFields.get(receiver) ?? new Set<string>();
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names.add(descriptor.exportedName);
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describedFields.set(receiver, names);
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}
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const defined = descriptor ?? commonJsAssignedExports(node, state);
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if (defined !== undefined && t.isCallExpression(node))
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captures.set(
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node,
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mode !== "ordered"
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? null
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: isUnshadowedGlobal(defined.receiver, state, "exports")
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? exportsIdentity
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: publicIdentity,
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);
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},
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exit: (node) => {
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const mode = execution.pop() ?? "conditional";
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if (publicCallWrites.has(node)) {
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if (mode === "deferred") deferredReplacement = true;
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else publicIdentity = null;
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}
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if (t.isAssignmentExpression(node)) {
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const left = unwrapJavaScriptExpression(node.left).node;
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const identity =
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node.operator === "=" &&
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(t.isIdentifier(left) ||
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t.isMemberExpression(left) ||
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t.isOptionalMemberExpression(left))
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? valueOf(node.right)
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: null;
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for (const target of semanticWriteTargets(node.left))
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write(target, identity, mode);
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values.set(node, identity);
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} else if (t.isVariableDeclarator(node) && node.init != null) {
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for (const target of semanticWriteTargets(node.id))
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write(
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target,
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t.isIdentifier(node.id) ? valueOf(node.init) : null,
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mode,
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);
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} else if (t.isForOfStatement(node) || t.isForInStatement(node)) {
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if (!t.isVariableDeclaration(node.left))
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for (const target of semanticWriteTargets(node.left))
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write(target, null, mode);
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} else if (
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t.isUpdateExpression(node) ||
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t.isUnaryExpression(node, { operator: "delete" })
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) {
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if (t.isUnaryExpression(node, { operator: "delete" })) {
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const name = commonJsExportName(node.argument, state);
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if (
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name !== undefined &&
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!isCommonJsModuleExports(node.argument, state) &&
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(t.isMemberExpression(node.argument) ||
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t.isOptionalMemberExpression(node.argument))
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) {
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const receiver = isUnshadowedGlobal(
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node.argument.object,
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state,
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"exports",
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)
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? exportsIdentity
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: publicIdentity;
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const fields = deletions.get(receiver) ?? new Map();
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fields.set(name, {
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node,
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mode: name === "*" && mode === "ordered" ? "conditional" : mode,
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});
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deletions.set(receiver, fields);
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}
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}
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write(node.argument, null, mode);
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} else if (isUnshadowedGlobal(node, state, "exports")) {
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values.set(node, exportsIdentity);
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} else if (isCommonJsModuleExports(node, state)) {
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values.set(node, publicIdentity);
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} else if (
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t.isObjectExpression(node) ||
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t.isArrayExpression(node) ||
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t.isFunctionExpression(node) ||
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t.isArrowFunctionExpression(node) ||
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t.isClassExpression(node)
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) {
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values.set(node, node);
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fresh.add(node);
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} else if (t.isSequenceExpression(node)) {
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const last = node.expressions.at(-1);
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values.set(node, last === undefined ? null : valueOf(last));
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}
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},
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},
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});
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);
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const effects = new Map<CommonJsExportSite, CommonJsExportReceiverEffect>();
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for (const [node, receiver] of captures) {
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const status: ReceiverStatus =
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