[bug] yaml types -- ignores schema

[brandonkal]

https://github.com/denoland/deno/blob/9de8178c9b9bc21cc880ea81f163118408cc6c46/std/encoding/yaml/parse.ts#L28

Following the types for yaml.parseAll(), the caller expects this to function:

yaml.parseAll(result, undefined, { schema: yaml.JSON_SCHEMA })

However, parseAll types hide what is really going on:

export function loadAll<T extends CbFunction | LoaderStateOptions>(
  input: string,
  iteratorOrOption?: T,
  options?: LoaderStateOptions
): T extends CbFunction ? void : unknown[] {
  if (!isCbFunction(iteratorOrOption)) {
    return loadDocuments(input, iteratorOrOption as LoaderStateOptions) as Any;

undefined is not a callback function and so the third parameter is ignored.

The way to call it is like so, which the types do not allow:

//@ts-ignore -- this is a bug in YAML library
yaml.parseAll(result, { schema: yaml.JSON_SCHEMA })

[stale]

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