| 23 | * @returns A Promise that resolves once the installation is finished. |
| 24 | */ |
| 25 | export function install( |
| 26 | root: string, |
| 27 | dependencies: string[] | null, |
| 28 | { useYarn, isOnline, devDependencies }: InstallArgs |
| 29 | ): Promise<void> { |
| 30 | /** |
| 31 | * NPM-specific command-line flags. |
| 32 | */ |
| 33 | const npmFlags: string[] = ['--logLevel', 'error'] |
| 34 | /** |
| 35 | * Yarn-specific command-line flags. |
| 36 | */ |
| 37 | const yarnFlags: string[] = [] |
| 38 | /** |
| 39 | * Return a Promise that resolves once the installation is finished. |
| 40 | */ |
| 41 | return new Promise((resolve, reject) => { |
| 42 | let args: string[] |
| 43 | let command: string = useYarn ? 'yarnpkg' : 'npm' |
| 44 | |
| 45 | if (dependencies && dependencies.length) { |
| 46 | /** |
| 47 | * If there are dependencies, run a variation of `{displayCommand} add`. |
| 48 | */ |
| 49 | if (useYarn) { |
| 50 | /** |
| 51 | * Call `yarn add --exact (--offline)? (-D)? ...`. |
| 52 | */ |
| 53 | args = ['add', '--exact'] |
| 54 | if (!isOnline) args.push('--offline') |
| 55 | args.push('--cwd', root) |
| 56 | if (devDependencies) args.push('--dev') |
| 57 | args.push(...dependencies) |
| 58 | } else { |
| 59 | /** |
| 60 | * Call `npm install [--save|--save-dev] ...`. |
| 61 | */ |
| 62 | args = ['install', '--save-exact'] |
| 63 | args.push(devDependencies ? '--save-dev' : '--save') |
| 64 | args.push(...dependencies) |
| 65 | } |
| 66 | } else { |
| 67 | /** |
| 68 | * If there are no dependencies, run a variation of `{displayCommand} |
| 69 | * install`. |
| 70 | */ |
| 71 | args = ['install'] |
| 72 | if (!isOnline) { |
| 73 | console.log(yellow('You appear to be offline.')) |
| 74 | if (useYarn) { |
| 75 | console.log(yellow('Falling back to the local Yarn cache.')) |
| 76 | console.log() |
| 77 | args.push('--offline') |
| 78 | } else { |
| 79 | console.log() |
| 80 | } |
| 81 | } |
| 82 | } |