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Add test for module resolution with package json containing main field referencing js file in sub directory
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‎tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.errors.txt

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/index.ts(1,19): error TS2307: Cannot find module 'foo'.
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==== /node_modules/foo/package.json (0 errors) ====
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{ "name": "foo", "version": "1.2.3", "main": "src/index.js" }
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==== /node_modules/foo/src/index.d.ts (0 errors) ====
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export const x: number;
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==== /index.ts (1 errors) ====
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import { x } from "foo";
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~~~~~
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!!! error TS2307: Cannot find module 'foo'.
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‎tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.js

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//// [tests/cases/compiler/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.ts] ////
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//// [package.json]
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{ "name": "foo", "version": "1.2.3", "main": "src/index.js" }
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//// [index.d.ts]
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export const x: number;
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//// [index.ts]
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import { x } from "foo";
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//// [index.js]
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"use strict";
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exports.__esModule = true;

‎tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.symbols

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=== /node_modules/foo/src/index.d.ts ===
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export const x: number;
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>x : Symbol(x, Decl(index.d.ts, 0, 12))
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=== /index.ts ===
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import { x } from "foo";
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>x : Symbol(x, Decl(index.ts, 0, 8))
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‎tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.trace.json

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[
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"======== Resolving module 'foo' from '/index.ts'. ========",
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"Module resolution kind is not specified, using 'NodeJs'.",
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"Loading module 'foo' from 'node_modules' folder, target file type 'TypeScript'.",
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"'package.json' does not have a 'typings' field.",
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"'package.json' does not have a 'types' field.",
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"'package.json' has 'main' field 'src/index.js' that references '/node_modules/foo/src/index.js'.",
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"Found 'package.json' at '/node_modules/foo/package.json'. Package ID is 'foo/src/i.d.ts@1.2.3'.",
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"File '/node_modules/foo.ts' does not exist.",
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"File '/node_modules/foo.tsx' does not exist.",
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"File '/node_modules/foo.d.ts' does not exist.",
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"'package.json' does not have a 'typings' field.",
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"'package.json' does not have a 'types' field.",
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"File '/node_modules/foo/index.ts' does not exist.",
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"File '/node_modules/foo/index.tsx' does not exist.",
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"File '/node_modules/foo/index.d.ts' does not exist.",
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"Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
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"Loading module 'foo' from 'node_modules' folder, target file type 'JavaScript'.",
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"'package.json' does not have a 'typings' field.",
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"'package.json' does not have a 'types' field.",
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"'package.json' has 'main' field 'src/index.js' that references '/node_modules/foo/src/index.js'.",
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"Found 'package.json' at '/node_modules/foo/package.json'. Package ID is 'foo/src/i.d.ts@1.2.3'.",
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"File '/node_modules/foo.js' does not exist.",
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"File '/node_modules/foo.jsx' does not exist.",
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"'package.json' has 'main' field 'src/index.js' that references '/node_modules/foo/src/index.js'.",
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"File '/node_modules/foo/src/index.js' does not exist.",
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"Loading module as file / folder, candidate module location '/node_modules/foo/src/index.js', target file type 'JavaScript'.",
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"File '/node_modules/foo/src/index.js.js' does not exist.",
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"File '/node_modules/foo/src/index.js.jsx' does not exist.",
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"File name '/node_modules/foo/src/index.js' has a '.js' extension - stripping it.",
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"File '/node_modules/foo/src/index.js' does not exist.",
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"File '/node_modules/foo/src/index.jsx' does not exist.",
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"Directory '/node_modules/foo/src/index.js' does not exist, skipping all lookups in it.",
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"File '/node_modules/foo/index.js' does not exist.",
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"File '/node_modules/foo/index.jsx' does not exist.",
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"======== Module name 'foo' was not resolved. ========"
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]

‎tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.types

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=== /node_modules/foo/src/index.d.ts ===
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export const x: number;
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>x : number
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=== /index.ts ===
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import { x } from "foo";
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>x : any
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‎tests/cases/compiler/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.ts

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// @traceResolution: true
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// @Filename: /node_modules/foo/package.json
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{ "name": "foo", "version": "1.2.3", "main": "src/index.js" }
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// @Filename: /node_modules/foo/src/index.d.ts
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export const x: number;
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// @Filename: /index.ts
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import { x } from "foo";

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