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2 changes: 1 addition & 1 deletion packages/typescript/src/options/validate.ts
Original file line number Diff line number Diff line change
Expand Up @@ -83,7 +83,7 @@ export function validatePaths(
}
}

if (compilerOptions.declaration || compilerOptions.declarationMap) {
if (compilerOptions.declaration || compilerOptions.declarationMap || compilerOptions.composite) {
if (DIRECTORY_PROPS.every((dirProperty) => !compilerOptions[dirProperty])) {
context.error(
`@rollup/plugin-typescript: 'outDir' or 'declarationDir' must be specified to generate declaration files.`
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12 changes: 10 additions & 2 deletions packages/typescript/test/test.js
Original file line number Diff line number Diff line change
Expand Up @@ -162,13 +162,13 @@ test.serial('supports creating declaration files in declarationDir', async (t) =
t.true(output[1].source.includes('declare const answer = 42;'), output[1].source);
});

test.serial('ensures outDir is set when creating declaration files', async (t) => {
async function ensureOutDirWhenCreatingDeclarationFiles(t, compilerOptionName) {
const bundle = await rollup({
input: 'fixtures/basic/main.ts',
plugins: [
typescript({
tsconfig: 'fixtures/basic/tsconfig.json',
declaration: true
[compilerOptionName]: true
})
],
onwarn
Expand All @@ -183,6 +183,14 @@ test.serial('ensures outDir is set when creating declaration files', async (t) =
),
`Unexpected error message: ${caughtError.message}`
);
}

test.serial('ensures outDir is set when creating declaration files (declaration)', async (t) => {
await ensureOutDirWhenCreatingDeclarationFiles(t, 'declaration');
});

test.serial('ensures outDir is set when creating declaration files (composite)', async (t) => {
await ensureOutDirWhenCreatingDeclarationFiles(t, 'composite');
});

test.serial('ensures outDir is located in Rollup output dir', async (t) => {
Expand Down