MIRROR: javascript for 🐜's, a tiny runtime with big ambitions
typescript type only import elision
+64
-1
+1
-1
src/strip/src/strip.rs
+1
-1
src/strip/src/strip.rs
+63
tests/test_typescript_type_only_import_elision.cjs
+63
tests/test_typescript_type_only_import_elision.cjs
···
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const { spawnSync } = require('child_process');
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const fs = require('fs');
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const os = require('os');
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const path = require('path');
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function assert(condition, message) {
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if (!condition) throw new Error(message);
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}
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const tmpRoot = fs.mkdtempSync(path.join(os.tmpdir(), 'ant-ts-type-import-'));
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const packageRoot = path.join(tmpRoot, 'node_modules', '@acme', 'ts-type-imports');
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const scriptPath = path.join(tmpRoot, 'entry.ts');
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fs.mkdirSync(path.join(packageRoot, 'util'), { recursive: true });
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+
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fs.writeFileSync(
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path.join(packageRoot, 'package.json'),
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JSON.stringify(
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{
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name: '@acme/ts-type-imports',
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type: 'module',
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exports: {
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import: './util/loader_mjs.mjs'
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}
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},
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null,
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2
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)
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);
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fs.writeFileSync(path.join(packageRoot, 'util', 'loader_mjs.mjs'), ['export const RuntimeThing = 42;', ''].join('\n'));
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fs.writeFileSync(
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scriptPath,
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[
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"import { RuntimeThing, MissingType, MissingTypeTwo } from '@acme/ts-type-imports';",
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'const one = null as unknown as MissingType;',
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'const two = null as unknown as MissingTypeTwo;',
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'void one;',
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'void two;',
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'console.log(RuntimeThing);',
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''
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].join('\n')
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);
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const result = spawnSync(process.execPath, [scriptPath], {
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cwd: tmpRoot,
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encoding: 'utf8'
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});
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if (result.error) throw result.error;
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assert(
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result.status === 0,
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`expected type-only imports in .ts entrypoint to be erased, got ${result.status}\nstdout:\n${result.stdout}\nstderr:\n${result.stderr}`
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);
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assert(result.stdout === '42\n', `expected stdout to be 42, got ${JSON.stringify(result.stdout)}`);
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assert(
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!/does not provide an export named 'MissingType'/.test(result.stderr),
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`expected no missing named export error for type-only import, got stderr:\n${result.stderr}`
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);
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console.log('TypeScript type-only import elision works');