update

package/node_modules/bin-links/lib/shim-bin.js

@@ -0,0 +1,86 @@
+const { resolve, dirname } = require('path')
+const { lstat } = require('fs/promises')
+const throwNonEnoent = er => {
+  if (er.code !== 'ENOENT') {
+    throw er
+  }
+}
+
+const cmdShim = require('cmd-shim')
+const readCmdShim = require('read-cmd-shim')
+
+const fixBin = require('./fix-bin.js')
+
+// even in --force mode, we never create a shim over a shim we've
+// already created.  you can have multiple packages in a tree trying
+// to contend for the same bin, which creates a race condition and
+// nondeterminism.
+const seen = new Set()
+
+const failEEXIST = ({ to, from }) =>
+  Promise.reject(Object.assign(new Error('EEXIST: file already exists'), {
+    path: to,
+    dest: from,
+    code: 'EEXIST',
+  }))
+
+const handleReadCmdShimError = ({ er, from, to }) =>
+  er.code === 'ENOENT' ? null
+  : er.code === 'ENOTASHIM' ? failEEXIST({ from, to })
+  : Promise.reject(er)
+
+const SKIP = Symbol('skip - missing or already installed')
+const shimBin = ({ path, to, from, absFrom, force }) => {
+  const shims = [
+    to,
+    to + '.cmd',
+    to + '.ps1',
+  ]
+
+  for (const shim of shims) {
+    if (seen.has(shim)) {
+      return true
+    }
+    seen.add(shim)
+  }
+
+  return Promise.all([
+    ...shims,
+    absFrom,
+  ].map(f => lstat(f).catch(throwNonEnoent))).then((stats) => {
+    const [, , , stFrom] = stats
+    if (!stFrom) {
+      return SKIP
+    }
+
+    if (force) {
+      return false
+    }
+
+    return Promise.all(shims.map((s, i) => [s, stats[i]]).map(([s, st]) => {
+      if (!st) {
+        return false
+      }
+      return readCmdShim(s)
+        .then(target => {
+          target = resolve(dirname(to), target)
+          if (target.indexOf(resolve(path)) !== 0) {
+            return failEEXIST({ from, to, path })
+          }
+          return false
+        }, er => handleReadCmdShimError({ er, from, to }))
+    }))
+  })
+    .then(skip => skip !== SKIP && doShim(absFrom, to))
+}
+
+const doShim = (absFrom, to) =>
+  cmdShim(absFrom, to).then(() => fixBin(absFrom))
+
+const resetSeen = () => {
+  for (const p of seen) {
+    seen.delete(p)
+  }
+}
+
+module.exports = Object.assign(shimBin, { resetSeen })