3 examples of 'npm downgrade' in JavaScript

113
function runSimpleUpgrade(version) {
114
    return new TPromise(function (resolve) {
115
        var npmCommand = version ? 'npm install -g npm@' + version : 'npm install -g npm',
116
            stdout = [],
117
            stderr = [],
118
            child = void 0;
119
120
        try {
121
            child = spawn('powershell.exe', ['-NoProfile', '-NoLogo', npmCommand]);
122
        } catch (error) {
123
            // This is dirty, but the best way for us to try/catch right now
124
            resolve({ error: error });
125
        }
126
127
        child.stdout.on('data', function (data) {
128
            return stdout.push(data.toString());
129
        });
130
        child.stderr.on('data', function (data) {
131
            return stderr.push(data.toString());
132
        });
133
134
        child.on('exit', function () {
135
            return resolve({ stderr: stderr, stdout: stdout });
136
        });
137
138
        child.stdin.end();
139
    });
140
}

26
installNpmPackage(name: string, version: string | null | undefined, cwd: string = this.scopes.localPath) {
27
  const versionWithDelimiter = version ? `@${version}` : '';
28
  const cmd = `npm i --save ${name}${versionWithDelimiter}`;
29
  return this.command.runCmd(cmd, cwd);
30
}

70
function installVersion(version, forceInstall) {
71
    return resolveVersion(version)
72
    .then(function(_version) {
73
        version = _version;
74
        return Q.nfcall(tmp.dir.bind(tmp));
75
    })
76
    .spread(function(tmpDir) {
77
        var options = {
78
            name: 'gitbook',
79
            version: version,
80
            path: tmpDir,
81
            forceInstall: !!forceInstall,
82
            npmLoad: {
83
                loglevel: 'silent',
84
                loaded: false,
85
                prefix: tmpDir
86
            }
87
        };
88
        console.log('Installing GitBook', version);
89
        return Q.nfcall(npmi.bind(npmi), options).thenResolve(tmpDir);
90
    })
91
    .then(function(tmpDir) {
92
        var gitbookRoot = path.resolve(tmpDir, 'node_modules/gitbook');
93
        var packageJson = fs.readJsonSync(path.resolve(gitbookRoot, 'package.json'));
94
        var version = packageJson.version;
95
96
        var outputFolder = path.resolve(config.VERSIONS_ROOT, version);
97
98
        if (!tags.isValid(version)) throw 'Invalid GitBook version, should satisfies '+config.GITBOOK_VERSION;
99
100
        // Copy to the install folder
101
        return Q.nfcall(fs.copy.bind(fs), gitbookRoot, outputFolder)
102
        .thenResolve(version);
103
    });
104
}