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Add ducktyped Promise checks (fixes #472)

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Vanilagy
2026-08-26 11:24:24 +02:00
parent 0f9dc1f91b
commit 14fb7d0119
19 changed files with 162 additions and 128 deletions
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src/source.ts
+8 -7
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@@ -14,6 +14,7 @@ import {
closedIntervalsOverlap,
FilePath,
isNumber,
isThenable,
isWebKit,
MaybePromise,
mergeRequestInit,
@@ -328,7 +329,7 @@ export abstract class PathedSource extends Source {
return ref;
};
if (result instanceof Promise) {
if (isThenable(result)) {
return result.then(handle);
} else {
return handle(result);
@@ -387,7 +388,7 @@ export class CustomPathedSource extends PathedSource {
return ref;
};
if (result instanceof Promise) {
if (isThenable(result)) {
this._rootRequest = result.then(handle);
} else {
handle(result);
@@ -894,7 +895,7 @@ export class UrlSource extends PathedSource {
return result;
};
if (result instanceof Promise) {
if (isThenable(result)) {
return result.then(processResult);
} else {
return processResult(result);
@@ -1198,7 +1199,7 @@ export class UrlSource extends PathedSource {
for (const slice of uniqueSlices) {
const result = backing._read(slice.start, slice.start + slice.bytes.length);
if (result instanceof Promise) {
if (isThenable(result)) {
result.then((readResult) => {
if (readResult) {
// The backing's cache is empty at this point, so the read is guaranteed to produce
@@ -1459,7 +1460,7 @@ export class CustomSource extends Source {
const result = this._options.getSize();
if (result instanceof Promise) {
if (isThenable(result)) {
return result.then((size) => {
if (!Number.isInteger(size) || size < 0) {
throw new TypeError('options.getSize must return or resolve to a non-negative integer.');
@@ -1485,7 +1486,7 @@ export class CustomSource extends Source {
const originalTargetPos = worker.targetPos;
let data = this._options.read(worker.currentPos, originalTargetPos);
if (data instanceof Promise) data = await data;
if (isThenable(data)) data = await data;
if (worker.aborted) {
break;
@@ -2706,7 +2707,7 @@ export class RangedSource extends Source {
return result;
};
if (result instanceof Promise) {
if (isThenable(result)) {
return result.then(processResult);
} else {
return processResult(result);