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(fix): respect tsconfig esModuleInterop flag #327

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merged 1 commit into from
Dec 13, 2019
Merged

(fix): respect tsconfig esModuleInterop flag #327

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17 changes: 14 additions & 3 deletions src/createRollupConfig.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,9 @@
import { safeVariableName, safePackageName, external } from './utils';
import {
safeVariableName,
safePackageName,
external,
resolveApp,
} from './utils';
import { paths } from './constants';
import { terser } from 'rollup-plugin-terser';
import { DEFAULT_EXTENSIONS } from '@babel/core';
Expand All @@ -12,6 +17,7 @@ import typescript from 'rollup-plugin-typescript2';
import { extractErrors } from './errors/extractErrors';
import { babelPluginTsdx } from './babelPluginTsdx';
import { TsdxOptions } from './types';
import * as fs from 'fs-extra';

const errorCodeOpts = {
errorMapFilePath: paths.appErrorsJson,
Expand Down Expand Up @@ -39,6 +45,11 @@ export function createRollupConfig(opts: TsdxOptions) {
.filter(Boolean)
.join('.');

let tsconfigJSON;
try {
tsconfigJSON = fs.readJSONSync(resolveApp('tsconfig.json'));
} catch (e) {}

return {
// Tell Rollup the entry point to the package
input: opts.input,
Expand All @@ -58,8 +69,8 @@ export function createRollupConfig(opts: TsdxOptions) {
// Do not let Rollup call Object.freeze() on namespace import objects
// (i.e. import * as namespaceImportObject from...) that are accessed dynamically.
freeze: false,
// Do not let Rollup add a `__esModule: true` property when generating exports for non-ESM formats.
esModule: false,
// Respect tsconfig esModuleInterop when setting __esModule.
esModule: tsconfigJSON ? tsconfigJSON.esModuleInterop : false,
// Rollup has treeshaking by default, but we can optimize it further...
treeshake: {
// We assume reading a property of an object never has side-effects.
Expand Down