diff --git a/src/language-css/index.js b/src/language-css/index.js
index ce51557b3..f7245dc81 100644
--- a/src/language-css/index.js
+++ b/src/language-css/index.js
@@ -5,35 +5,31 @@ const options = require("./options");
 const createLanguage = require("../utils/create-language");
 
 const languages = [
-  createLanguage(require("linguist-languages/data/CSS"), data =>
-    Object.assign(data, {
-      since: "1.4.0",
-      parsers: ["css"],
-      vscodeLanguageIds: ["css"]
-    })
-  ),
-  createLanguage(require("linguist-languages/data/PostCSS"), data =>
-    Object.assign(data, {
-      since: "1.4.0",
-      parsers: ["css"],
-      vscodeLanguageIds: ["postcss"],
-      extensions: data.extensions.concat(".postcss")
-    })
-  ),
-  createLanguage(require("linguist-languages/data/Less"), data =>
-    Object.assign(data, {
-      since: "1.4.0",
-      parsers: ["less"],
-      vscodeLanguageIds: ["less"]
-    })
-  ),
-  createLanguage(require("linguist-languages/data/SCSS"), data =>
-    Object.assign(data, {
-      since: "1.4.0",
-      parsers: ["scss"],
-      vscodeLanguageIds: ["scss"]
-    })
-  )
+  createLanguage(require("linguist-languages/data/CSS"), data => ({
+    ...data,
+    since: "1.4.0",
+    parsers: ["css"],
+    vscodeLanguageIds: ["css"]
+  })),
+  createLanguage(require("linguist-languages/data/PostCSS"), data => ({
+    ...data,
+    since: "1.4.0",
+    parsers: ["css"],
+    vscodeLanguageIds: ["postcss"],
+    extensions: data.extensions.concat(".postcss")
+  })),
+  createLanguage(require("linguist-languages/data/Less"), data => ({
+    ...data,
+    since: "1.4.0",
+    parsers: ["less"],
+    vscodeLanguageIds: ["less"]
+  })),
+  createLanguage(require("linguist-languages/data/SCSS"), data => ({
+    ...data,
+    since: "1.4.0",
+    parsers: ["scss"],
+    vscodeLanguageIds: ["scss"]
+  }))
 ];
 
 const printers = {
diff --git a/src/language-graphql/index.js b/src/language-graphql/index.js
index 971e822d0..249f593bb 100644
--- a/src/language-graphql/index.js
+++ b/src/language-graphql/index.js
@@ -5,13 +5,12 @@ const options = require("./options");
 const createLanguage = require("../utils/create-language");
 
 const languages = [
-  createLanguage(require("linguist-languages/data/GraphQL"), data =>
-    Object.assign(data, {
-      since: "1.5.0",
-      parsers: ["graphql"],
-      vscodeLanguageIds: ["graphql"]
-    })
-  )
+  createLanguage(require("linguist-languages/data/GraphQL"), data => ({
+    ...data,
+    since: "1.5.0",
+    parsers: ["graphql"],
+    vscodeLanguageIds: ["graphql"]
+  }))
 ];
 
 const printers = {
diff --git a/src/language-handlebars/index.js b/src/language-handlebars/index.js
index 9a5fa49b9..ae529a582 100644
--- a/src/language-handlebars/index.js
+++ b/src/language-handlebars/index.js
@@ -4,13 +4,12 @@ const printer = require("./printer-glimmer");
 const createLanguage = require("../utils/create-language");
 
 const languages = [
-  createLanguage(require("linguist-languages/data/Handlebars"), data =>
-    Object.assign(data, {
-      since: null, // unreleased
-      parsers: ["glimmer"],
-      vscodeLanguageIds: ["handlebars"]
-    })
-  )
+  createLanguage(require("linguist-languages/data/Handlebars"), data => ({
+    ...data,
+    since: null, // unreleased
+    parsers: ["glimmer"],
+    vscodeLanguageIds: ["handlebars"]
+  }))
 ];
 
 const printers = {
diff --git a/src/language-html/index.js b/src/language-html/index.js
index fc2e81b3c..afbc37aa8 100644
--- a/src/language-html/index.js
+++ b/src/language-html/index.js
@@ -5,43 +5,39 @@ const createLanguage = require("../utils/create-language");
 const options = require("./options");
 
 const languages = [
-  createLanguage(require("linguist-languages/data/HTML"), data =>
-    Object.assign(data, {
-      name: "Angular",
-      since: "1.15.0",
-      parsers: ["angular"],
-      vscodeLanguageIds: ["html"],
-      extensions: [".component.html"],
-      filenames: []
-    })
-  ),
-  createLanguage(require("linguist-languages/data/HTML"), data =>
-    Object.assign(data, {
-      since: "1.15.0",
-      parsers: ["html"],
-      vscodeLanguageIds: ["html"],
-      extensions: data.extensions.concat([
-        ".mjml" // MJML is considered XML in Linguist but it should be formatted as HTML
-      ])
-    })
-  ),
-  createLanguage(require("linguist-languages/data/HTML"), data =>
-    Object.assign(data, {
-      name: "Lightning Web Components",
-      since: "1.17.0",
-      parsers: ["lwc"],
-      vscodeLanguageIds: ["html"],
-      extensions: [],
-      filenames: []
-    })
-  ),
-  createLanguage(require("linguist-languages/data/Vue"), data =>
-    Object.assign(data, {
-      since: "1.10.0",
-      parsers: ["vue"],
-      vscodeLanguageIds: ["vue"]
-    })
-  )
+  createLanguage(require("linguist-languages/data/HTML"), data => ({
+    ...data,
+    name: "Angular",
+    since: "1.15.0",
+    parsers: ["angular"],
+    vscodeLanguageIds: ["html"],
+    extensions: [".component.html"],
+    filenames: []
+  })),
+  createLanguage(require("linguist-languages/data/HTML"), data => ({
+    ...data,
+    since: "1.15.0",
+    parsers: ["html"],
+    vscodeLanguageIds: ["html"],
+    extensions: data.extensions.concat([
+      ".mjml" // MJML is considered XML in Linguist but it should be formatted as HTML
+    ])
+  })),
+  createLanguage(require("linguist-languages/data/HTML"), data => ({
+    ...data,
+    name: "Lightning Web Components",
+    since: "1.17.0",
+    parsers: ["lwc"],
+    vscodeLanguageIds: ["html"],
+    extensions: [],
+    filenames: []
+  })),
+  createLanguage(require("linguist-languages/data/Vue"), data => ({
+    ...data,
+    since: "1.10.0",
+    parsers: ["vue"],
+    vscodeLanguageIds: ["vue"]
+  }))
 ];
 
 const printers = {
diff --git a/src/language-js/index.js b/src/language-js/index.js
index 7c80fd7a7..db1aa0710 100644
--- a/src/language-js/index.js
+++ b/src/language-js/index.js
@@ -6,79 +6,73 @@ const options = require("./options");
 const createLanguage = require("../utils/create-language");
 
 const languages = [
-  createLanguage(require("linguist-languages/data/JavaScript"), data =>
-    Object.assign(data, {
-      since: "0.0.0",
-      parsers: ["babel", "flow"],
-      vscodeLanguageIds: ["javascript", "mongo"],
-      interpreters: data.interpreters.concat(["nodejs"])
-    })
-  ),
-  createLanguage(require("linguist-languages/data/JavaScript"), data =>
-    Object.assign(data, {
-      name: "Flow",
-      since: "0.0.0",
-      parsers: ["babel", "flow"],
-      vscodeLanguageIds: ["javascript"],
-      aliases: [],
-      filenames: [],
-      extensions: [".js.flow"]
-    })
-  ),
-  createLanguage(require("linguist-languages/data/JSX"), data =>
-    Object.assign(data, {
-      since: "0.0.0",
-      parsers: ["babel", "flow"],
-      vscodeLanguageIds: ["javascriptreact"]
-    })
-  ),
-  createLanguage(require("linguist-languages/data/TypeScript"), data =>
-    Object.assign(data, {
-      since: "1.4.0",
-      parsers: ["typescript"],
-      vscodeLanguageIds: ["typescript"]
-    })
-  ),
-  createLanguage(require("linguist-languages/data/TSX"), data =>
-    Object.assign(data, {
-      since: "1.4.0",
-      parsers: ["typescript"],
-      vscodeLanguageIds: ["typescriptreact"]
-    })
-  ),
-  createLanguage(require("linguist-languages/data/JSON"), data =>
-    Object.assign(data, {
-      name: "JSON.stringify",
-      since: "1.13.0",
-      parsers: ["json-stringify"],
-      vscodeLanguageIds: ["json"],
-      extensions: [], // .json file defaults to json instead of json-stringify
-      filenames: ["package.json", "package-lock.json", "composer.json"]
-    })
-  ),
-  createLanguage(require("linguist-languages/data/JSON"), data =>
-    Object.assign(data, {
-      since: "1.5.0",
-      parsers: ["json"],
-      vscodeLanguageIds: ["json"],
-      filenames: data.filenames.concat([".prettierrc"])
-    })
-  ),
-  createLanguage(require("linguist-languages/data/JSON with Comments"), data =>
-    Object.assign(data, {
+  createLanguage(require("linguist-languages/data/JavaScript"), data => ({
+    ...data,
+    since: "0.0.0",
+    parsers: ["babel", "flow"],
+    vscodeLanguageIds: ["javascript", "mongo"],
+    interpreters: data.interpreters.concat(["nodejs"])
+  })),
+  createLanguage(require("linguist-languages/data/JavaScript"), data => ({
+    ...data,
+    name: "Flow",
+    since: "0.0.0",
+    parsers: ["babel", "flow"],
+    vscodeLanguageIds: ["javascript"],
+    aliases: [],
+    filenames: [],
+    extensions: [".js.flow"]
+  })),
+  createLanguage(require("linguist-languages/data/JSX"), data => ({
+    ...data,
+    since: "0.0.0",
+    parsers: ["babel", "flow"],
+    vscodeLanguageIds: ["javascriptreact"]
+  })),
+  createLanguage(require("linguist-languages/data/TypeScript"), data => ({
+    ...data,
+    since: "1.4.0",
+    parsers: ["typescript"],
+    vscodeLanguageIds: ["typescript"]
+  })),
+  createLanguage(require("linguist-languages/data/TSX"), data => ({
+    ...data,
+    since: "1.4.0",
+    parsers: ["typescript"],
+    vscodeLanguageIds: ["typescriptreact"]
+  })),
+  createLanguage(require("linguist-languages/data/JSON"), data => ({
+    ...data,
+    name: "JSON.stringify",
+    since: "1.13.0",
+    parsers: ["json-stringify"],
+    vscodeLanguageIds: ["json"],
+    extensions: [], // .json file defaults to json instead of json-stringify
+    filenames: ["package.json", "package-lock.json", "composer.json"]
+  })),
+  createLanguage(require("linguist-languages/data/JSON"), data => ({
+    ...data,
+    since: "1.5.0",
+    parsers: ["json"],
+    vscodeLanguageIds: ["json"],
+    filenames: data.filenames.concat([".prettierrc"])
+  })),
+  createLanguage(
+    require("linguist-languages/data/JSON with Comments"),
+    data => ({
+      ...data,
       since: "1.5.0",
       parsers: ["json"],
       vscodeLanguageIds: ["jsonc"],
       filenames: data.filenames.concat([".eslintrc"])
     })
   ),
-  createLanguage(require("linguist-languages/data/JSON5"), data =>
-    Object.assign(data, {
-      since: "1.13.0",
-      parsers: ["json5"],
-      vscodeLanguageIds: ["json5"]
-    })
-  )
+  createLanguage(require("linguist-languages/data/JSON5"), data => ({
+    ...data,
+    since: "1.13.0",
+    parsers: ["json5"],
+    vscodeLanguageIds: ["json5"]
+  }))
 ];
 
 const printers = {
diff --git a/src/language-markdown/index.js b/src/language-markdown/index.js
index 887a8fd61..337e34741 100644
--- a/src/language-markdown/index.js
+++ b/src/language-markdown/index.js
@@ -5,25 +5,23 @@ const options = require("./options");
 const createLanguage = require("../utils/create-language");
 
 const languages = [
-  createLanguage(require("linguist-languages/data/Markdown"), data =>
-    Object.assign(data, {
-      since: "1.8.0",
-      parsers: ["remark"],
-      vscodeLanguageIds: ["markdown"],
-      filenames: data.filenames.concat(["README"]),
-      extensions: data.extensions.filter(extension => extension !== ".mdx")
-    })
-  ),
-  createLanguage(require("linguist-languages/data/Markdown"), data =>
-    Object.assign(data, {
-      name: "MDX",
-      since: "1.15.0",
-      parsers: ["mdx"],
-      vscodeLanguageIds: ["mdx"],
-      filenames: [],
-      extensions: [".mdx"]
-    })
-  )
+  createLanguage(require("linguist-languages/data/Markdown"), data => ({
+    ...data,
+    since: "1.8.0",
+    parsers: ["remark"],
+    vscodeLanguageIds: ["markdown"],
+    filenames: data.filenames.concat(["README"]),
+    extensions: data.extensions.filter(extension => extension !== ".mdx")
+  })),
+  createLanguage(require("linguist-languages/data/Markdown"), data => ({
+    ...data,
+    name: "MDX",
+    since: "1.15.0",
+    parsers: ["mdx"],
+    vscodeLanguageIds: ["mdx"],
+    filenames: [],
+    extensions: [".mdx"]
+  }))
 ];
 
 const printers = {
diff --git a/src/language-yaml/index.js b/src/language-yaml/index.js
index 7cacfad5b..a0a66be9a 100644
--- a/src/language-yaml/index.js
+++ b/src/language-yaml/index.js
@@ -5,13 +5,12 @@ const options = require("./options");
 const createLanguage = require("../utils/create-language");
 
 const languages = [
-  createLanguage(require("linguist-languages/data/YAML"), data =>
-    Object.assign(data, {
-      since: "1.14.0",
-      parsers: ["yaml"],
-      vscodeLanguageIds: ["yaml"]
-    })
-  )
+  createLanguage(require("linguist-languages/data/YAML"), data => ({
+    ...data,
+    since: "1.14.0",
+    parsers: ["yaml"],
+    vscodeLanguageIds: ["yaml"]
+  }))
 ];
 
 module.exports = {