Jest 平台工具

用于识别 git/hg 存储库中已修改文件的工具。 导出两个函数：

• 返回一个resolved状态的Promise，此Promise包含修改文件和仓库信息。
• findRepos 返回一个resolved状态的Promise，此Promise包含指定路径的一组仓库数据。

获取更多信息，请关注jest-changed-files中的 Readme。

jest-diff

数据更改的可视化工具。 输出一个函数，两个任何类型的值输入该函数后，返回一个“较易读”的字符串来展现其区别。

例子

const {diff} = require('jest-diff');
const a = {a: {b: {c: 5}}};
const b = {a: {b: {c: 6}}};
const result = diff(a, b);
// print diff
console.log(result);

Tool for extracting and parsing the comments at the top of a JavaScript file. Exports various functions to manipulate the data inside the comment block. Exports various functions to manipulate the data inside the comment block.

jest-get-type

Module that identifies the primitive type of any JavaScript value. Module that identifies the primitive type of any JavaScript value. Exports a function that returns a string with the type of the value passed as argument.

例子

const {getType} = require('jest-get-type');
const nullValue = null;
const undefinedValue = undefined;
// prints 'array'
console.log(getType(array));
// prints 'null'
console.log(getType(nullValue));
console.log(getType(undefinedValue));

用于验证用户提交的配置的工具。 Exports a function that takes two arguments: the user’s configuration and an object containing an example configuration and other options. The return value is an object with two attributes: The return value is an object with two attributes:

• hasDeprecationWarnings, a boolean indicating whether the submitted configuration has deprecation warnings,
• isValid, 一个布尔值, 指示配置是否正确。

You can read more about jest-validate in the .

jest-worker

用于任务并行化的模块。 导出一个 Worker 类，传入 Node.js 的路径，可以让你调用模块导出的方法，就像是这个类的方法一样，返回一个承诺，当指定的方法在分支进程里执行完成的时候就会解析。

例子

module.exports = {
    // long running CPU intensive task.
  },
};

main.js

You can read more about jest-worker in the readme file.

Exports a function that converts any JavaScript value into a human-readable string. Supports all built-in JavaScript types out of the box and allows extension for application-specific types via user-defined plugins. Supports all built-in JavaScript types out of the box and allows extension for application-specific types via user-defined plugins.

const {format: prettyFormat} = require('pretty-format');
const val = {object: {}};
val.circularReference = val;
val[Symbol('foo')] = 'foo';
val.map = new Map([['prop', 'value']]);
val.array = [-0, Infinity, NaN];
console.log(prettyFormat(val));

You can read more about pretty-format in the .