chai-snapshots/lib/index.js

Snapshot generator and matcher for chai

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const _ = require("lodash");
const fs = require("fs");
let snapshotContents;
let snapshots = {};
let pathToSnaps = "";
let currentTest;
exports.SnapshotMatchers = function (options = {}) {
    options.pathToSnaps = options.pathToSnaps || "./src/__tests__/snaps.json";
    options.ignoredAttributes = options.ignoredAttributes || [];
    options.devMode = typeof options.devMode === "undefined" ? false : true;
    pathToSnaps = options.pathToSnaps;
    return function (chai) {
        try {
            snapshotContents = fs.readFileSync(options.pathToSnaps, { flag: "r" }).toString();
        }
        catch (e) {
            snapshotContents = "";
        }
        if (snapshotContents && snapshotContents.length > 0) {
            snapshots = JSON.parse(snapshotContents);
        }
        chai.Assertion.addMethod('matchSnapshotJSON', function (key) {
            const obj = this._obj;
            chai.expect(obj).not.to.be.undefined;
            chai.expect(obj).not.to.be.null;
            chai.expect(obj).not.to.be.false;
            const ctx = this;
            const path = key || _.snakeCase(currentTest.fullTitle());
            let snapshot = snapshots[path];
            if (!snapshot || options.devMode) {
                snapshots[path] = snapshot = _.cloneDeep(obj);
            }
            ;
            const expected = JSON.stringify(snapshot, (key, value) => {
                if (_.includes(options.ignoredAttributes, key))
                    return undefined;
                return value;
            }, 2);
            const actual = JSON.stringify(obj, (key, value) => {
                if (_.includes(options.ignoredAttributes, key))
                    return undefined;
                return value;
            }, 2);
            chai.expect(expected, "Expected snapshot to match").to.eql(actual);
        });
    };
};
if (after) {
    after(function () {
        const data = JSON.stringify(snapshots, undefined, 2);
        fs.writeFileSync(pathToSnaps, data, { flag: "w+" });
    });
}
if (beforeEach) {
    beforeEach(function () {
        currentTest = this.currentTest;
    });
}
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