core: add helpers for working with paths across OSes (#1102)

packages/core/src/path-utils.ts

@@ -0,0 +1,35 @@
+import * as path from 'path'
+
+/**
+ * toPosixPath converts the given path to the posix form. On Windows, \\ will be
+ * replaced with /.
+ *
+ * @param pth. Path to transform.
+ * @return string Posix path.
+ */
+export function toPosixPath(pth: string): string {
+  return pth.replace(/[\\]/g, '/')
+}
+
+/**
+ * toWin32Path converts the given path to the win32 form. On Linux, / will be
+ * replaced with \\.
+ *
+ * @param pth. Path to transform.
+ * @return string Win32 path.
+ */
+export function toWin32Path(pth: string): string {
+  return pth.replace(/[/]/g, '\\')
+}
+
+/**
+ * toPlatformPath converts the given path to a platform-specific path. It does
+ * this by replacing instances of / and \ with the platform-specific path
+ * separator.
+ *
+ * @param pth The path to platformize.
+ * @return string The platform-specific path.
+ */
+export function toPlatformPath(pth: string): string {
+  return pth.replace(/[/\\]/g, path.sep)
+}