TypeScript is.undefined函数代码示例

export const save = ({
  attachment,
  document,
  index,
  getAbsolutePath,
  timestamp,
}: {
  attachment: Attachment;
  document: Document;
  index: number;
  getAbsolutePath: (relativePath: string) => string;
  timestamp?: number;
}): void => {
  const isObjectURLRequired = is.undefined(attachment.path);
  const url = !is.undefined(attachment.path)
    ? getAbsolutePath(attachment.path)
    : arrayBufferToObjectURL({
        data: attachment.data,
        type: MIME.APPLICATION_OCTET_STREAM,
      });
  const filename = getSuggestedFilename({ attachment, timestamp, index });
  saveURLAsFile({ url, filename, document });
  if (isObjectURLRequired) {
    URL.revokeObjectURL(url);
  }
};

export default function merge<Target extends {[key: string]: unknown}, Source extends {[key: string]: unknown}>(target: Target, ...sources: Source[]): Target & Source {
	for (const source of sources) {
		for (const [key, sourceValue] of Object.entries(source)) {
			if (is.undefined(sourceValue)) {
				continue;
			}

			const targetValue = target[key];
			if (targetValue instanceof URLSearchParams && sourceValue instanceof URLSearchParams) {
				const params = new URLSearchParams();

				const append = (value: string, key: string) => params.append(key, value);
				targetValue.forEach(append);
				sourceValue.forEach(append);

				target[key] = params;
			} else if (is.urlInstance(targetValue) && (is.urlInstance(sourceValue) || is.string(sourceValue))) {
				target[key] = new URL(sourceValue as string, targetValue);
			} else if (is.plainObject(sourceValue)) {
				if (is.plainObject(targetValue)) {
					target[key] = merge({}, targetValue, sourceValue);
				} else {
					target[key] = merge({}, sourceValue);
				}
			} else if (is.array(sourceValue)) {
				target[key] = merge([], sourceValue);
			} else {
				target[key] = sourceValue;
			}
		}
	}

	return target as Target & Source;
}

export const isWindows = (minVersion?: string) => {
  const osRelease = os.release();

  if (process.platform !== 'win32') {
    return false;
  }

  return is.undefined(minVersion) ? true : semver.gte(osRelease, minVersion);
};

export const isVoiceMessage = (attachment: Attachment): boolean => {
  const flag = SignalService.AttachmentPointer.Flags.VOICE_MESSAGE;
  const hasFlag =
    // tslint:disable-next-line no-bitwise
    !is.undefined(attachment.flags) && (attachment.flags & flag) === flag;
  if (hasFlag) {
    return true;
  }

  const isLegacyAndroidVoiceMessage =
    !is.undefined(attachment.contentType) &&
    MIME.isAudio(attachment.contentType) &&
    attachment.fileName === null;
  if (isLegacyAndroidVoiceMessage) {
    return true;
  }

  return false;
};

	constructor(message: string, error: ErrorWithCode, options: Options) {
		super(message);
		Error.captureStackTrace(this, this.constructor);
		this.name = 'GotError';

		if (!is.undefined(error.code)) {
			this.code = error.code;
		}

		Object.defineProperty(this, 'options', {
			value: options
		});
	}

	setImmediate(async () => {
		try {
			for (const hook of options.hooks.beforeRequest) {
				// eslint-disable-next-line no-await-in-loop
				await hook(options);
			}

			// Serialize body
			const {body, headers} = options;
			const isForm = !is.nullOrUndefined(options.form);
			const isJSON = !is.nullOrUndefined(options.json);
			const isBody = !is.nullOrUndefined(body);
			if ((isBody || isForm || isJSON) && withoutBody.has(options.method)) {
				throw new TypeError(`The \`${options.method}\` method cannot be used with a body`);
			}

			if (isBody) {
				if (isForm || isJSON) {
					throw new TypeError('The `body` option cannot be used with the `json` option or `form` option');
				}

				if (is.object(body) && isFormData(body)) {
					// Special case for https://github.com/form-data/form-data
					headers['content-type'] = headers['content-type'] || `multipart/form-data; boundary=${body.getBoundary()}`;
				} else if (!is.nodeStream(body) && !is.string(body) && !is.buffer(body)) {
					throw new TypeError('The `body` option must be a stream.Readable, string, Buffer, Object or Array');
				}
			} else if (isForm) {
				if (!is.object(options.form)) {
					throw new TypeError('The `form` option must be an Object');
				}

				headers['content-type'] = headers['content-type'] || 'application/x-www-form-urlencoded';
				options.body = (new URLSearchParams(options.form)).toString();
			} else if (isJSON) {
				headers['content-type'] = headers['content-type'] || 'application/json';
				options.body = JSON.stringify(options.json);
			}

			// Convert buffer to stream to receive upload progress events (#322)
			if (is.buffer(body)) {
				options.body = toReadableStream(body);
				uploadBodySize = body.length;
			} else {
				uploadBodySize = await getBodySize(options);
			}

			if (is.undefined(headers['content-length']) && is.undefined(headers['transfer-encoding'])) {
				if ((uploadBodySize > 0 || options.method === 'PUT') && !is.undefined(uploadBodySize)) {
					headers['content-length'] = uploadBodySize;
				}
			}

			if (!options.stream && options.responseType === 'json' && is.undefined(headers.accept)) {
				options.headers.accept = 'application/json';
			}

			requestUrl = options.href || (new URL(options.path, urlLib.format(options))).toString();

			await get(options);
		} catch (error) {
			emitError(error);
		}
	});

//.........这里部分代码省略.........

	if (options.query) {
		if (!shownDeprecation) {
			console.warn('`options.query` is deprecated. We support it solely for compatibility - it will be removed in Got 11. Use `options.searchParams` instead.');
			shownDeprecation = true;
		}

		searchParams = options.query;
		delete options.query;
	}

	// TODO: This should be used in the `options` type instead
	interface SearchParams {
		[key: string]: string | number | boolean | null;
	}

	if (is.nonEmptyString(searchParams) || is.nonEmptyObject(searchParams) || searchParams instanceof URLSearchParams) {
		if (!is.string(searchParams)) {
			if (!(searchParams instanceof URLSearchParams)) {
				validateSearchParams(searchParams);
				searchParams = searchParams as SearchParams;
			}

			searchParams = (new URLSearchParams(searchParams)).toString();
		}

		options.path = `${options.path.split('?')[0]}?${searchParams}`;
	}

	if (options.hostname === 'unix') {
		const matches = /(.+?):(.+)/.exec(options.path);

		if (matches) {
			const [, socketPath, path] = matches;
			options = {
				...options,
				socketPath,
				path,
				host: null
			};
		}
	}

	const {headers} = options;
	for (const [key, value] of Object.entries(headers)) {
		if (is.nullOrUndefined(value)) {
			delete headers[key];
		}
	}

	if (options.decompress && is.undefined(headers['accept-encoding'])) {
		headers['accept-encoding'] = supportsBrotli ? 'gzip, deflate, br' : 'gzip, deflate';
	}

	if (options.method) {
		options.method = options.method.toUpperCase();
	}

	if (!is.function_(options.retry.retries)) {
		const {retries} = options.retry;

		options.retry.retries = (iteration, error) => {
			if (iteration > retries) {
				return 0;
			}

			const hasCode = Reflect.has(error, 'code') && options.retry.errorCodes.has(error.code);
			const hasMethod = Reflect.has(error, 'options') && options.retry.methods.has(error.options.method);
			const hasStatusCode = Reflect.has(error, 'response') && options.retry.statusCodes.has(error.response.statusCode);
			if ((!error || !hasCode) && (!hasMethod || !hasStatusCode)) {
				return 0;
			}

			const {response} = error;
			if (response && Reflect.has(response.headers, 'retry-after') && retryAfterStatusCodes.has(response.statusCode)) {
				let after = Number(response.headers['retry-after']);
				if (is.nan(after)) {
					after = Date.parse(response.headers['retry-after']) - Date.now();
				} else {
					after *= 1000;
				}

				if (after > options.retry.maxRetryAfter) {
					return 0;
				}

				return after;
			}

			if (response && response.statusCode === 413) {
				return 0;
			}

			const noise = Math.random() * 100;
			return ((2 ** (iteration - 1)) * 1000) + noise;
		};
	}

	return options;
};