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fix(opentelemetry-instrumentation-fetch): fixed override of headers #2426

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5 changes: 5 additions & 0 deletions packages/opentelemetry-instrumentation-fetch/src/fetch.ts
Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,11 @@ export class FetchInstrumentation extends InstrumentationBase<
api.propagation.inject(api.context.active(), options.headers, {
set: (h, k, v) => h.set(k, typeof v === 'string' ? v : String(v)),
});
} else if(options.headers instanceof Headers) {
// ||-operator causes ts type error
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What is this comment referring to?

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I tried to use the ||-operator inside the if-statement to avoid the else if and the code duplication. But it caused a type error at the setter-parameter of the api.propagation.inject-function.

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The comment is pretty unclear on its own. I would just remove it since it's a typing issue and not a functionality caveat.

api.propagation.inject(api.context.active(), options.headers, {
set: (h, k, v) => h.set(k, typeof v === 'string' ? v : String(v)),
});
} else {
const headers: Partial<Record<string, unknown>> = {};
api.propagation.inject(api.context.active(), headers);
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