Cherry-pick PR #47433 into release-4.5 (#47515)

Component commits:
fce282b Add failing test.

ea2c290 Update failing test.

d954948 Finalized failing test case.

f476e84 Separate our usages of utilities that expect variables initialized to require(...) and require(...).foo.

9f0810c Renamed types and utilities, removed accidental indentation.

bf708bf Renamed both utilitiy functions uniformly.

Co-authored-by: Daniel Rosenwasser <[email protected]>

src/compiler/binder.ts

@@ -3288,7 +3288,7 @@ namespace ts {
             }
 
             if (!isBindingPattern(node.name)) {
-                if (isInJSFile(node) && isRequireVariableDeclaration(node) && !getJSDocTypeTag(node)) {
+                if (isInJSFile(node) && isVariableDeclarationInitializedToBareOrAccessedRequire(node) && !getJSDocTypeTag(node)) {
                     declareSymbolAndAddToSymbolTable(node as Declaration, SymbolFlags.Alias, SymbolFlags.AliasExcludes);
                 }
                 else if (isBlockOrCatchScoped(node)) {

src/compiler/checker.ts

@@ -2592,7 +2592,7 @@ namespace ts {
                     && isAliasableOrJsExpression(node.parent.right)
                 || node.kind === SyntaxKind.ShorthandPropertyAssignment
                 || node.kind === SyntaxKind.PropertyAssignment && isAliasableOrJsExpression((node as PropertyAssignment).initializer)
-                || isRequireVariableDeclaration(node);
+                || isVariableDeclarationInitializedToBareOrAccessedRequire(node);
         }
 
         function isAliasableOrJsExpression(e: Expression) {
@@ -36831,7 +36831,7 @@ namespace ts {
             }
             // For a commonjs `const x = require`, validate the alias and exit
             const symbol = getSymbolOfNode(node);
-            if (symbol.flags & SymbolFlags.Alias && isRequireVariableDeclaration(node)) {
+            if (symbol.flags & SymbolFlags.Alias && isVariableDeclarationInitializedToBareOrAccessedRequire(node)) {
                 checkAliasSymbol(node);
                 return;
             }

src/compiler/types.ts

@@ -4637,7 +4637,7 @@ namespace ts {
     export type AnyImportSyntax = ImportDeclaration | ImportEqualsDeclaration;
 
     /* @internal */
-    export type AnyImportOrRequire = AnyImportSyntax | RequireVariableDeclaration;
+    export type AnyImportOrRequire = AnyImportSyntax | VariableDeclarationInitializedTo<RequireOrImportCall>;
 
     /* @internal */
     export type AnyImportOrRequireStatement = AnyImportSyntax | RequireVariableStatement;
@@ -4662,8 +4662,8 @@ namespace ts {
     export type RequireOrImportCall = CallExpression & { expression: Identifier, arguments: [StringLiteralLike] };
 
     /* @internal */
-    export interface RequireVariableDeclaration extends VariableDeclaration {
-        readonly initializer: RequireOrImportCall;
+    export interface VariableDeclarationInitializedTo<T extends Expression> extends VariableDeclaration {
+        readonly initializer: T;
     }
 
     /* @internal */
@@ -4673,7 +4673,7 @@ namespace ts {
 
     /* @internal */
     export interface RequireVariableDeclarationList extends VariableDeclarationList {
-        readonly declarations: NodeArray<RequireVariableDeclaration>;
+        readonly declarations: NodeArray<VariableDeclarationInitializedTo<RequireOrImportCall>>;
     }
 
     /* @internal */

src/compiler/utilities.ts

@@ -2046,7 +2046,7 @@ namespace ts {
     }
 
     export function getExternalModuleRequireArgument(node: Node) {
-        return isRequireVariableDeclaration(node) && (getLeftmostAccessExpression(node.initializer) as CallExpression).arguments[0] as StringLiteral;
+        return isVariableDeclarationInitializedToBareOrAccessedRequire(node) && (getLeftmostAccessExpression(node.initializer) as CallExpression).arguments[0] as StringLiteral;
     }
 
     export function isInternalModuleImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration {
@@ -2113,17 +2113,30 @@ namespace ts {
      * Returns true if the node is a VariableDeclaration initialized to a require call (see `isRequireCall`).
      * This function does not test if the node is in a JavaScript file or not.
      */
-    export function isRequireVariableDeclaration(node: Node): node is RequireVariableDeclaration {
+    export function isVariableDeclarationInitializedToRequire(node: Node): node is VariableDeclarationInitializedTo<RequireOrImportCall> {
+        return isVariableDeclarationInitializedWithRequireHelper(node, /*allowAccessedRequire*/ false);
+    }
+
+    /**
+     * Like {@link isVariableDeclarationInitializedToRequire} but allows things like `require("...").foo.bar` or `require("...")["baz"]`.
+     */
+    export function isVariableDeclarationInitializedToBareOrAccessedRequire(node: Node): node is VariableDeclarationInitializedTo<RequireOrImportCall | AccessExpression> {
+        return isVariableDeclarationInitializedWithRequireHelper(node, /*allowAccessedRequire*/ true);
+    }
+
+    function isVariableDeclarationInitializedWithRequireHelper(node: Node, allowAccessedRequire: boolean) {
         if (node.kind === SyntaxKind.BindingElement) {
             node = node.parent.parent;
         }
-        return isVariableDeclaration(node) && !!node.initializer && isRequireCall(getLeftmostAccessExpression(node.initializer), /*requireStringLiteralLikeArgument*/ true);
+        return isVariableDeclaration(node) &&
+            !!node.initializer &&
+            isRequireCall(allowAccessedRequire ? getLeftmostAccessExpression(node.initializer) : node.initializer, /*requireStringLiteralLikeArgument*/ true);
     }
 
     export function isRequireVariableStatement(node: Node): node is RequireVariableStatement {
         return isVariableStatement(node)
             && node.declarationList.declarations.length > 0
-            && every(node.declarationList.declarations, decl => isRequireVariableDeclaration(decl));
+            && every(node.declarationList.declarations, decl => isVariableDeclarationInitializedToRequire(decl));
     }
 
     export function isSingleOrDoubleQuote(charCode: number) {

src/services/codefixes/importFixes.ts

@@ -535,7 +535,7 @@ namespace ts.codefix {
         const importKind = getImportKind(importingFile, exportKind, compilerOptions);
         return mapDefined(importingFile.imports, (moduleSpecifier): FixAddToExistingImportInfo | undefined => {
             const i = importFromModuleSpecifier(moduleSpecifier);
-            if (isRequireVariableDeclaration(i.parent)) {
+            if (isVariableDeclarationInitializedToRequire(i.parent)) {
                 return checker.resolveExternalModuleName(moduleSpecifier) === moduleSymbol ? { declaration: i.parent, importKind, symbol, targetFlags } : undefined;
             }
             if (i.kind === SyntaxKind.ImportDeclaration || i.kind === SyntaxKind.ImportEqualsDeclaration) {

src/services/findAllReferences.ts

@@ -1531,7 +1531,7 @@ namespace ts.FindAllReferences {
             // Use the parent symbol if the location is commonjs require syntax on javascript files only.
             if (isInJSFile(referenceLocation)
                 && referenceLocation.parent.kind === SyntaxKind.BindingElement
-                && isRequireVariableDeclaration(referenceLocation.parent)) {
+                && isVariableDeclarationInitializedToBareOrAccessedRequire(referenceLocation.parent)) {
                 referenceSymbol = referenceLocation.parent.symbol;
                 // The parent will not have a symbol if it's an ObjectBindingPattern (when destructuring is used).  In
                 // this case, just skip it, since the bound identifiers are not an alias of the import.

src/services/goToDefinition.ts

@@ -287,7 +287,7 @@ namespace ts.GoToDefinition {
                 return declaration.parent.kind === SyntaxKind.NamedImports;
             case SyntaxKind.BindingElement:
             case SyntaxKind.VariableDeclaration:
-                return isInJSFile(declaration) && isRequireVariableDeclaration(declaration);
+                return isInJSFile(declaration) && isVariableDeclarationInitializedToBareOrAccessedRequire(declaration);
             default:
                 return false;
         }

src/services/importTracker.ts

@@ -621,7 +621,7 @@ namespace ts.FindAllReferences {
                 Debug.assert((parent as ImportClause | NamespaceImport).name === node);
                 return true;
             case SyntaxKind.BindingElement:
-                return isInJSFile(node) && isRequireVariableDeclaration(parent);
+                return isInJSFile(node) && isVariableDeclarationInitializedToBareOrAccessedRequire(parent);
             default:
                 return false;
         }

tests/cases/fourslash/importFixesWithExistingDottedRequire.ts

@@ -0,0 +1,21 @@
+/// <reference path="./fourslash.ts" />
+
+// @module: commonjs
+// @checkJs: true
+
+// @Filename: ./library.js
+//// module.exports.aaa = function() {}
+//// module.exports.bbb = function() {}
+
+// @Filename: ./foo.js
+//// var aaa = require("./library.js").aaa;
+//// aaa();
+//// /*$*/bbb
+
+goTo.marker("$")
+verify.codeFixAvailable([
+    { description: "Import 'bbb' from module \"./library.js\"" },
+    { description: "Ignore this error message" },
+    { description: "Disable checking for this file" },
+    { description: "Convert to ES module" },
+]);