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[HOLD] fix(worker): Avoid webpack error on "node:" modules in workflows #1037

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[HOLD] fix(worker): Avoid webpack error on "node:" modules in workflows #1037

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023c27d
fix(worker): Avoid webpack error on "node:" modules in workflows
mjameswh Jan 26, 2023
8039205
- Remove `alias` for things that `externals` can do
mjameswh Jan 28, 2023
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5 changes: 4 additions & 1 deletion packages/test/src/mocks/workflows-with-node-dependencies/example/client.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,10 @@
import dns from 'dns';
import http from 'node:http';

export function exampleHeavyweightFunction(): void {
// Dummy code, only to ensure dependencies on 'dns' and 'node:http' do not get removed.
// This code will actually never run.
dns.resolve('localhost', () => {
/* ignore */
http.get('localhost');
});
}
2 changes: 1 addition & 1 deletion packages/test/src/test-bundler.ts
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Expand Up @@ -61,7 +61,7 @@ if (RUN_INTEGRATION_TESTS) {
const taskQueue = `${t.title}-${uuid4()}`;
const workflowBundle = await bundleWorkflowCode({
workflowsPath: require.resolve('./mocks/workflows-with-node-dependencies/issue-516'),
ignoreModules: ['dns'],
ignoreModules: ['dns', 'http'],
});
const worker = await Worker.create({
taskQueue,
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25 changes: 15 additions & 10 deletions packages/worker/src/workflow/bundler.ts
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Expand Up @@ -68,7 +68,7 @@ export class WorkflowCodeBundler {
this.payloadConverterPath = payloadConverterPath;
this.failureConverterPath = failureConverterPath;
this.workflowInterceptorModules = workflowInterceptorModules ?? defaultWorflowInterceptorModules;
this.ignoreModules = ignoreModules ?? [];
this.ignoreModules = (ignoreModules ?? []).map((x) => (x.startsWith('node:') ? x.substring('node:'.length) : x));
this.webpackConfigHook = webpackConfigHook ?? ((config) => config);
}

Expand Down Expand Up @@ -183,14 +183,20 @@ exports.importInterceptors = function importInterceptors() {
entry: string,
distDir: string
): Promise<string> {
const captureProblematicModules: Configuration['externals'] = async (data, _callback): Promise<undefined> => {
// Ignore the "node:" prefix if any.
const module: string = data.request?.startsWith('node:')
? data.request.slice('node:'.length)
: data.request ?? '';

if (moduleMatches(module, disallowedModules) && !moduleMatches(module, this.ignoreModules)) {
this.foundProblematicModules.add(module);
const captureProblematicModules: Configuration['externals'] = async (
data,
_callback
): Promise<string | undefined> => {
const hasNodePrefix = data.request?.startsWith('node:');
const module: string = (hasNodePrefix ? data.request?.slice('node:'.length) : data.request) ?? '';
if (hasNodePrefix || moduleMatches(module, disallowedModules) || moduleMatches(module, this.ignoreModules)) {
if (!moduleMatches(module, this.ignoreModules)) {
this.foundProblematicModules.add(module);
}

// Tell webpack to replace that module by an empty object.
// This is functionnally equivalent to `alias: { 'some-module': false }`, but `externals` is called much more early
return 'var {}';
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Should we change to return an empty object? Is this better experience in your opinion?

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Not sure what you mean... Do you mean var false vs var {}?

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We used to return undefined here.

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Oh, I see... Actually, THIS is the fix.

By returning var {}, we are telling Webpack to replace imports of that module by an empty object. This is essentially the same as what we do with alias, but externals is called much earlier in the process, so that we can still handle invalid namespaces such as node:.

}

return undefined;
Expand All @@ -204,7 +210,6 @@ exports.importInterceptors = function importInterceptors() {
alias: {
__temporal_custom_payload_converter$: this.payloadConverterPath ?? false,
__temporal_custom_failure_converter$: this.failureConverterPath ?? false,
...Object.fromEntries([...this.ignoreModules, ...disallowedModules].map((m) => [m, false])),
},
},
externals: captureProblematicModules,
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