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Cherry-pick PR #47657 into release-4.6 (#48223)
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Component commits:
4516fa8 fix(47597): ignore commented imports following template expression

Co-authored-by: Oleksandr T <oleksandr.tarasiuk@outlook.com>
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@a-tarasyuk
TypeScript Bot and a-tarasyuk authored Mar 16, 2022
1 parent e397ed1 commit cfdef9d
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36 changes: 36 additions & 0 deletions src/services/preProcess.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -345,6 +345,42 @@ namespace ts {
break;
}

if (scanner.getToken() === SyntaxKind.TemplateHead) {
const stack = [scanner.getToken()];
let token = scanner.scan();
loop: while (length(stack)) {
switch (token) {
case SyntaxKind.EndOfFileToken:
break loop;
case SyntaxKind.ImportKeyword:
tryConsumeImport();
break;
case SyntaxKind.TemplateHead:
stack.push(token);
break;
case SyntaxKind.OpenBraceToken:
if (length(stack)) {
stack.push(token);
}
break;
case SyntaxKind.CloseBraceToken:
if (length(stack)) {
if (lastOrUndefined(stack) === SyntaxKind.TemplateHead) {
if (scanner.reScanTemplateToken(/* isTaggedTemplate */ false) === SyntaxKind.TemplateTail) {
stack.pop();
}
}
else {
stack.pop();
}
}
break;
}
token = scanner.scan();
}
nextToken();
}

// check if at least one of alternative have moved scanner forward
if (tryConsumeDeclare() ||
tryConsumeImport() ||
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171 changes: 171 additions & 0 deletions src/testRunner/unittests/services/preProcessFile.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,177 @@ describe("unittests:: services:: PreProcessFile:", () => {
});
});

it("Correctly ignore commented imports following template expression", () => {
/* eslint-disable no-template-curly-in-string */
test("/**" + "\n" +
" * Before" + "\n" +
" * ```" + "\n" +
" * import * as a from \"a\";" + "\n" +
" * ```" + "\n" +
" */" + "\n" +
"type Foo = `${string}`;" + "\n" +
"/**" + "\n" +
" * After" + "\n" +
" * ```" + "\n" +
" * import { B } from \"b\";" + "\n" +
" * import * as c from \"c\";" + "\n" +
" * ```" + "\n" +
" */",
/*readImportFile*/ true,
/*detectJavaScriptImports*/ true,
{
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
importedFiles: [],
ambientExternalModules: undefined,
isLibFile: false
});
/* eslint-enable no-template-curly-in-string */
});

it("Correctly returns imports after a template expression", () => {
/* eslint-disable no-template-curly-in-string */
test("`${foo}`; import \"./foo\";",
/*readImportFile*/ true,
/*detectJavaScriptImports*/ true,
{
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
importedFiles: [
{ fileName: "./foo", pos: 17, end: 22 }
],
ambientExternalModules: undefined,
isLibFile: false
});
/* eslint-enable no-template-curly-in-string */
});

it("Correctly returns dynamic imports from template expression", () => {
/* eslint-disable no-template-curly-in-string */
test("`${(<div>Text `` ${} text {} " + "\n" +
"${import(\"a\")} {import(\"b\")} " + "\n" +
"${/* A comment */} ${/* import(\"ignored\") */} </div>)}`",
/*readImportFile*/ true,
/*detectJavaScriptImports*/ true,
{
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
importedFiles: [
{ fileName: "a", pos: 39, end: 40 },
{ fileName: "b", pos: 53, end: 54 }
],
ambientExternalModules: undefined,
isLibFile: false
});
/* eslint-enable no-template-curly-in-string */
});

it("Correctly returns dynamic imports from nested template expression", () => {
/* eslint-disable no-template-curly-in-string */
test("`${foo(`${bar(`${import(\"a\")} ${import(\"b\")}`, `${baz(`${import(\"c\") ${import(\"d\")}`)}`)}`)}`",
/*readImportFile*/ true,
/*detectJavaScriptImports*/ true,
{
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
importedFiles: [
{ fileName: "a", pos: 24, end: 25 },
{ fileName: "b", pos: 39, end: 40 },
{ fileName: "c", pos: 64, end: 65 },
{ fileName: "d", pos: 78, end: 79 },
],
ambientExternalModules: undefined,
isLibFile: false
});
/* eslint-enable no-template-curly-in-string */
});

it("Correctly returns dynamic imports from tagged template expression", () => {
/* eslint-disable no-template-curly-in-string */
test("foo`${ fn({ a: 100 }, import(\"a\"), `${import(\"b\")}`, import(\"c\"), `${import(\"d\")} foo`, import(\"e\")) }`",
/*readImportFile*/ true,
/*detectJavaScriptImports*/ true,
{
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
importedFiles: [
{ fileName: "a", pos: 29, end: 30 },
{ fileName: "b", pos: 45, end: 46 },
{ fileName: "c", pos: 60, end: 61 },
{ fileName: "d", pos: 76, end: 77 },
{ fileName: "e", pos: 95, end: 96 },
],
ambientExternalModules: undefined,
isLibFile: false
});
/* eslint-enable no-template-curly-in-string */
});

it("Correctly returns dynamic imports from template expression and imports following it", () => {
/* eslint-disable no-template-curly-in-string */
test("const x = `hello ${await import(\"a\").default}`;" + "\n\n" +
"import { y } from \"b\";",
/*readImportFile*/ true,
/*detectJavaScriptImports*/ true,
{
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
importedFiles: [
{ fileName: "a", pos: 32, end: 33 },
{ fileName: "b", pos: 67, end: 68 },
],
ambientExternalModules: undefined,
isLibFile: false
});
/* eslint-enable no-template-curly-in-string */
});

it("Correctly returns dynamic imports from template expressions and other imports", () => {
/* eslint-disable no-template-curly-in-string */
test("const x = `x ${await import(\"a\").default}`;" + "\n\n" +
"import { y } from \"b\";" + "\n" +
"const y = `y ${import(\"c\")}`;" + "\n\n" +
"import { d } from \"d\";",
/*readImportFile*/ true,
/*detectJavaScriptImports*/ true,
{
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
importedFiles: [
{ fileName: "a", pos: 28, end: 29 },
{ fileName: "b", pos: 63, end: 64 },
{ fileName: "c", pos: 90, end: 91 },
{ fileName: "d", pos: 117, end: 118 },
],
ambientExternalModules: undefined,
isLibFile: false
});
/* eslint-enable no-template-curly-in-string */
});

it("Correctly returns empty importedFiles with incorrect template expression", () => {
/* eslint-disable no-template-curly-in-string */
test("const foo = `${",
/*readImportFile*/ true,
/*detectJavaScriptImports*/ true,
{
referencedFiles: [],
typeReferenceDirectives: [],
libReferenceDirectives: [],
importedFiles: [],
ambientExternalModules: undefined,
isLibFile: false
});
/* eslint-enable no-template-curly-in-string */
});

it("Correctly return ES6 exports", () => {
test("export * from \"m1\";" + "\n" +
"export {a} from \"m2\";" + "\n" +
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