synchronous variant of jsonata

.gitignore

@@ -10,3 +10,5 @@ npm-debug.log
 package-lock.json
 .idea/
 .nyc_output
+sync-test
+!sync/*

mmkal-mopub.mjs

@@ -0,0 +1,46 @@
+// run with `npx mopub --config mmkal-mopub.mjs`
+export default {
+  async transformPackage({helpers}) {
+    await helpers.editJsonFile('package.json', packageJson => {
+      packageJson.name = '@mmkal/jsonata'
+      packageJson.description = 'JSON query and transformation language. Can run synchronously or asynchronously.'
+    })
+
+    await helpers.editFile('README.md', readme => {
+      const dedent = (s) => s.replaceAll('\n           ', '\n').trim()
+      const [beginning, header1, middle, header2, end] = readme.split(/(## Installation|## More information)/).map(s => s.trim())
+      return [
+        beginning,
+        header1,
+        dedent(`
+            - \`npm install @mmkal/jsonata\`
+
+            ## Quick start
+
+            Presumably you are using \`@mmkal/jsonata\` rather than the upstream [jsonata](https://npmjs.com/package/jsonata) because you want the synchronous API. Here's how you use it:
+
+            In Node.js:
+
+            \`\`\`javascript
+            const jsonata = require('@mmkal/jsonata/sync');
+
+            const data = {
+                example: [
+                    {value: 4},
+                    {value: 7},
+                    {value: 13}
+                ]
+            };
+
+            const expression = jsonata('$sum(example.value)');
+            const result = expression.evaluate(data);  // returns 24
+            \`\`\`
+
+            Background: this package comes from [jsonata-js/jsonata#758](https://github.com/jsonata-js/jsonata/pull/758), which was opened after discussion in [jsonata-js/jsonata#733](https://github.com/jsonata-js/jsonata/issues/733).
+        `),
+        header2,
+        end
+      ].join('\n\n')
+    })
+  },
+}

package.json

@@ -2,17 +2,35 @@
   "name": "jsonata",
   "version": "2.1.0",
   "description": "JSON query and transformation language",
-  "module": "jsonata.js",
-  "main": "jsonata.js",
-  "typings": "jsonata.d.ts",
+  "sideEffects": false,
+  "files": [
+    "*.js",
+    "*.d.ts",
+    "src",
+    "sync"
+  ],
+  "exports": {
+    ".": {
+      "types": "./jsonata.d.ts",
+      "import": "./jsonata.js",
+      "require": "./jsonata.js"
+    },
+    "./sync": {
+      "types": "./sync/jsonata.d.ts",
+      "import": "./sync/jsonata.js",
+      "require": "./sync/jsonata.js"
+    }
+  },
   "homepage": "http://jsonata.org/",
   "repository": {
     "type": "git",
     "url": "https://github.com/jsonata-js/jsonata.git"
   },
   "scripts": {
+    "syncify": "node scripts/syncify.js && git diff --exit-code",
     "pretest": "npm run lint",
     "mocha": "nyc ./node_modules/mocha/bin/_mocha -- \"test/**/*.js\"",
+    "mocha-sync": "./node_modules/mocha/bin/_mocha -- \"sync-test/**/*.js\"",
     "test": "npm run mocha",
     "posttest": "npm run check-coverage && npm run browserify && npm run minify && npm run build-es5",
     "build-es5": "npm run mkdir-dist && npm run regenerator && npm run browserify-es5 && npm run minify-es5",