Normalize path imports for Windows (#5)

* add windows to build CI

* try path.normalize

* attempt to remove file extension

* try and use posix paths

* try to normalize to POSIX paths

* revert validation changes

* try using .posix everywhere

* add normalizeAbsolutePath

* fix path require

* undo CI changes (for now)

Author: mfix-stripe

src/loader.js

@@ -4,6 +4,14 @@ const Markdoc = require('@markdoc/markdoc');
 
 const DEFAULT_SCHEMA_PATH = './markdoc';
 
+// https://stackoverflow.com/questions/53799385/how-can-i-convert-a-windows-path-to-posix-path-using-node-path
+function normalizeAbsolutePath(s) {
+  return s
+    .replace(/^[a-zA-Z]:/, '') // replace C: for Windows
+    .split(path.sep)
+    .join(path.posix.sep);
+}
+
 async function gatherPartials(ast, schemaDir) {
   let partials = {};
 
@@ -16,7 +24,7 @@ async function gatherPartials(ast, schemaDir) {
       typeof file === 'string' &&
       !partials[file]
     ) {
-      const filepath = path.join(schemaDir, file);
+      const filepath = path.posix.join(schemaDir, file);
       // parsing is not done here because then we have to serialize and reload from JSON at runtime
       const content = await fs.promises.readFile(filepath, {encoding: 'utf8'});
 
@@ -46,7 +54,7 @@ async function load(source) {
   const {mode = 'static', schemaPath = DEFAULT_SCHEMA_PATH} =
     this.getOptions() || {};
 
-  const schemaDir = path.resolve(schemaPath || DEFAULT_SCHEMA_PATH);
+  const schemaDir = path.posix.resolve(schemaPath || DEFAULT_SCHEMA_PATH);
 
   // Grabs the path of the file relative to the `/pages` directory
   // to pass into the app props later.
@@ -113,7 +121,7 @@ async function load(source) {
   const partials = await gatherPartials.call(
     this,
     ast,
-    path.resolve(schemaDir, 'partials')
+    path.posix.resolve(schemaDir, 'partials')
   );
 
   // IDEA: consider making this an option per-page
@@ -126,7 +134,9 @@ async function load(source) {
 
     async function readDir(variable) {
       try {
-        const module = await resolve(schemaDir, variable);
+        const module = normalizeAbsolutePath(
+          await resolve(schemaDir, variable)
+        );
         return `import * as ${variable} from '${module}'`;
       } catch (error) {
         return `const ${variable} = {};`;
@@ -161,7 +171,9 @@ import yaml from 'js-yaml';
 // renderers is imported separately so Markdoc isn't sent to the client
 import Markdoc, {renderers} from '@markdoc/markdoc'
 
-import {getSchema} from '${await resolve(__dirname, './runtime')}';
+import {getSchema} from '${normalizeAbsolutePath(
+    await resolve(__dirname, './runtime')
+  )}';
 /**
  * Schema is imported like this so end-user's code is compiled using build-in babel/webpack configs.
  * This enables typescript/ESnext support