44 lines
1.7 KiB
JavaScript
44 lines
1.7 KiB
JavaScript
import {Buffer} from 'node:buffer';
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import {isUint8Array} from '../utils/uint-array.js';
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// Validate the type of chunk argument passed to transform generators
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export const getValidateTransformInput = (writableObjectMode, optionName) => writableObjectMode
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? undefined
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: validateStringTransformInput.bind(undefined, optionName);
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const validateStringTransformInput = function * (optionName, chunk) {
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if (typeof chunk !== 'string' && !isUint8Array(chunk) && !Buffer.isBuffer(chunk)) {
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throw new TypeError(`The \`${optionName}\` option's transform must use "objectMode: true" to receive as input: ${typeof chunk}.`);
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}
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yield chunk;
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};
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// Validate the type of the value returned by transform generators
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export const getValidateTransformReturn = (readableObjectMode, optionName) => readableObjectMode
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? validateObjectTransformReturn.bind(undefined, optionName)
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: validateStringTransformReturn.bind(undefined, optionName);
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const validateObjectTransformReturn = function * (optionName, chunk) {
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validateEmptyReturn(optionName, chunk);
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yield chunk;
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};
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const validateStringTransformReturn = function * (optionName, chunk) {
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validateEmptyReturn(optionName, chunk);
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if (typeof chunk !== 'string' && !isUint8Array(chunk)) {
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throw new TypeError(`The \`${optionName}\` option's function must yield a string or an Uint8Array, not ${typeof chunk}.`);
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}
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yield chunk;
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};
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const validateEmptyReturn = (optionName, chunk) => {
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if (chunk === null || chunk === undefined) {
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throw new TypeError(`The \`${optionName}\` option's function must not call \`yield ${chunk}\`.
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Instead, \`yield\` should either be called with a value, or not be called at all. For example:
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if (condition) { yield value; }`);
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}
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};
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