Create some files

src/self-installer/download.ts

@@ -0,0 +1,4 @@
+import download from 'download'
+import url from './url'
+export const downloadSelfInstaller = () => download(url)
+export default downloadSelfInstaller

src/self-installer/index.ts

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+export * from './url'
+export * from './download'

src/self-installer/url.ts

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+export const ref = '301414cec74a2b6b63c95b42f2ad1790ccb980ed'
+export const url = `https://raw.githubusercontent.com/pnpm/self-installer/${ref}/install.js`
+export default url