Do not require plugins to set 'since' field (#4038)

* Do not require plugins to set 'since' field

* Refactor

src/common/support.js

@@ -255,7 +255,12 @@ function getSupportInfo(version, opts) {
 
   const languages = plugins
     .reduce((all, plugin) => all.concat(plugin.languages), [])
-    .filter(language => language.since && semver.gte(version, language.since))
+    .filter(
+      language =>
+        language.since
+          ? semver.gte(version, language.since)
+          : language.since !== null
+    )
     .map(language => {
       // Prevent breaking changes
       if (language.name === "Markdown") {

src/language-handlebars/index.js

@@ -13,7 +13,8 @@ const languages = [
     extensions: [".handlebars", ".hbs"],
     tm_scope: "text.html.handlebars",
     ace_mode: "handlebars",
-    language_id: 155
+    language_id: 155,
+    since: null // unreleased
   }
 ];
 

src/language-html/index.js

@@ -8,7 +8,7 @@ const printer = require("./printer-htmlparser2");
 const languages = [
   {
     name: "HTML",
-    since: undefined, // unreleased
+    since: null, // unreleased
     parsers: ["parse5"],
     group: "HTML",
     tmScope: "text.html.basic",

src/main/options.js

@@ -81,7 +81,7 @@ function inferParser(filepath, plugins) {
     pluginsLoaded: true
   }).languages.find(
     language =>
-      typeof language.since === "string" &&
+      language.since !== null &&
       (language.extensions.indexOf(extension) > -1 ||
         (language.filenames &&
           language.filenames.find(name => name.toLowerCase() === filename)))

tests_integration/plugins/extensions/plugin.js

@@ -7,8 +7,7 @@ module.exports = {
     {
       name: "foo",
       parsers: ["foo-parser"],
-      extensions: [".foo"],
-      since: "1.0.0"
+      extensions: [".foo"]
     }
   ],
   parsers: {