Build: Update scripts for release (fixes #475)

lib/version.js

@@ -1,3 +1,3 @@
-const version = "7.3.1";
+const version = "main";
 
 export default version;

package.json

@@ -74,7 +74,10 @@
     "test": "npm-run-all -p unit lint",
     "lint": "eslint \"*.?(c)js\" lib/ tests/lib/",
     "fixlint": "npm run lint -- --fix",
-    "rollup": "rollup -c rollup.config.js",
+    "build": "rollup -c rollup.config.js",
+    "update-version": "node tools/update-version.js",
+    "pretest": "npm run build",
+    "prepublishOnly": "npm run update-version && npm run build",
     "sync-docs": "node sync-docs.js",
     "generate-release": "eslint-generate-release",
     "generate-alpharelease": "eslint-generate-prerelease alpha",

rollup.config.js

@@ -1,15 +1,6 @@
 import commonjs from "@rollup/plugin-commonjs";
 import resolve from "@rollup/plugin-node-resolve";
 import json from "@rollup/plugin-json";
-import fs from "fs";
-
-
-// the espree package version is exported from the module (i.e., import { version } from "espree")
-// read version from the package.json metadata and write it into lib/version.js at build time,
-// since esm cannot import json by default
-const pkg = JSON.parse(fs.readFileSync("./package.json", "utf8"));
-
-fs.writeFileSync("lib/version.js", `const version = "${pkg.version}";\n\nexport default version;\n`);
 
 export default {
     input: "espree.js",

tools/update-version.js

@@ -0,0 +1,17 @@
+/**
+ * @fileoverview Script to update lib/version.js to the value in package.json
+ * @author Nicholas C. Zakas
+ */
+
+import fs from "fs";
+
+/*
+ * IMPORTANT: This must be run *before* Rollup so the built package will have
+ * the correct version number exported.
+ *
+ * This is necessary because ESM can't import JSON files directly and we want
+ * this value to be available in the browser as well as in Node.js.
+ */
+
+const pkg = JSON.parse(fs.readFileSync("./package.json", "utf8"));
+fs.writeFileSync("lib/version.js", `const version = "${pkg.version}";\n\nexport default version;\n`);