chore: Remove lodash

package.json

@@ -17,7 +17,7 @@
     "fs-extra": "^10.0.0",
     "gatsby-core-utils": "^3.5.2",
     "kebab-hash": "^0.1.2",
-    "lodash": "^4.17.21",
+    "lodash.mergewith": "^4.6.2",
     "webpack-assets-manifest": "^5.0.6"
   },
   "devDependencies": {

src/build-headers-program.ts

@@ -3,7 +3,7 @@ import { parse, posix } from 'path'
 
 import { writeFile, existsSync } from 'fs-extra'
 import kebabHash from 'kebab-hash'
-import _ from 'lodash'
+import mergeWith from 'lodash.mergewith'
 
 import {
   HEADER_COMMENT,
@@ -15,14 +15,15 @@ import {
   NETLIFY_HEADERS_FILENAME,
   PAGE_DATA_DIR,
 } from './constants'
+import { isBoolean, flow } from './util'
 
 const getHeaderName = (header: any) => {
   const matches = header.match(/^([^:]+):/)
   return matches && matches[1]
 }
 
 const validHeaders = (headers: any, reporter: any) => {
-  if (!headers || !_.isObject(headers)) {
+  if (!headers || typeof headers !== 'object') {
     return false
   }
 
@@ -97,7 +98,7 @@ const preloadHeadersByPage = ({
   }
 
   pages.forEach((page: any) => {
-    const scripts = _.flatMap(COMMON_BUNDLES, (file) => getScriptPath(file, manifest))
+    const scripts = COMMON_BUNDLES.flatMap((file) => getScriptPath(file, manifest))
     scripts.push(
       ...getScriptPath(pathChunkName(page.path), manifest),
       ...getScriptPath(page.componentChunkName, manifest),
@@ -124,17 +125,15 @@ const preloadHeadersByPage = ({
   return linksByPage
 }
 
-const defaultMerge = (...headers: any[]) => {
-  const unionMerge = (objValue: any, srcValue: any) => {
-    if (Array.isArray(objValue)) {
-      return _.union(objValue, srcValue)
-    }
-    // opt into default merge behavior
+const unionMerge = (objValue: any, srcValue: any) => {
+  if (Array.isArray(objValue)) {
+    return [...new Set([...objValue, ...srcValue])]
   }
-
-  return _.mergeWith({}, ...headers, unionMerge)
+  // opt into default merge behavior
 }
 
+const defaultMerge = (...headers: any[]) => mergeWith({}, ...headers, unionMerge)
+
 const headersMerge = (userHeaders: any, defaultHeaders: any) => {
   const merged = {}
   Object.keys(defaultHeaders).forEach((path) => {
@@ -196,7 +195,7 @@ const validateUserOptions = (pluginOptions: any, reporter: any) => (headers: any
   }
 
   [`mergeSecurityHeaders`, `mergeLinkHeaders`, `mergeCachingHeaders`].forEach((mergeOption) => {
-    if (!_.isBoolean(pluginOptions[mergeOption])) {
+    if (!isBoolean(pluginOptions[mergeOption])) {
       throw new TypeError(
         `The "${mergeOption}" option to gatsby-plugin-netlify must be a boolean. Check your gatsby-config.js.`,
       )
@@ -314,11 +313,14 @@ const applyCachingHeaders =
     return defaultMerge(headers, cachingHeaders, CACHING_HEADERS)
   }
 
-const applyTransfromHeaders =
+const applyTransformHeaders =
   ({
     transformHeaders
   }: any) =>
-  (headers: any) => _.mapValues(headers, transformHeaders)
+  (headers: any) =>  Object.fromEntries(
+      Object.entries(headers).map(([key, value]) => [key, transformHeaders(value)])
+    )
+
 
 const transformToString = (headers: any) => `${HEADER_COMMENT}\n\n${stringifyHeaders(headers)}`
 
@@ -329,17 +331,18 @@ const writeHeadersFile =
   (contents: any) => writeFile(publicFolder(NETLIFY_HEADERS_FILENAME), contents)
 
 const buildHeadersProgram = (pluginData: any, pluginOptions: any, reporter: any) =>
-  _.flow(
+  flow(
+    [
     validateUserOptions(pluginOptions, reporter),
     mapUserLinkHeaders(pluginData),
     applySecurityHeaders(pluginOptions),
     applyCachingHeaders(pluginData, pluginOptions),
     mapUserLinkAllPageHeaders(pluginData, pluginOptions),
     applyLinkHeaders(pluginData, pluginOptions),
-    applyTransfromHeaders(pluginOptions),
+    applyTransformHeaders(pluginOptions),
     transformToString,
     writeHeadersFile(pluginData),
-  )(pluginOptions.headers)
+    ])(pluginOptions.headers)
 
 export default buildHeadersProgram
 /* eslint-enable max-lines */

src/constants.ts

@@ -1,5 +1,3 @@
-import _ from 'lodash'
-
 // Gatsby values
 export const BUILD_HTML_STAGE = `build-html`
 export const BUILD_CSS_STAGE = `build-css`
@@ -14,7 +12,7 @@ export const DEFAULT_OPTIONS = {
   mergeSecurityHeaders: true,
   mergeLinkHeaders: true,
   mergeCachingHeaders: true,
-  transformHeaders: _.identity,
+  transformHeaders: (value) => value,
   generateMatchPathRewrites: true,
 }
 

src/util.ts

@@ -0,0 +1,12 @@
+// Accounting for true, false, and new Boolean()
+export const isBoolean = (val: any): boolean => typeof val === 'boolean' ||
+    (
+      typeof val === 'object' &&
+      val !== null &&
+      typeof val.valueOf() === 'boolean'
+    )
+
+export const flow =
+  funcs =>
+  (...args) =>
+    funcs.reduce((prev, fnc) => [fnc(...prev)], args)[0]

yarn.lock

@@ -9158,6 +9158,11 @@ lodash.merge@^4.6.2:
   resolved "https://registry.yarnpkg.com/lodash.merge/-/lodash.merge-4.6.2.tgz#558aa53b43b661e1925a0afdfa36a9a1085fe57a"
   integrity sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==
 
+lodash.mergewith@^4.6.2:
+  version "4.6.2"
+  resolved "https://registry.yarnpkg.com/lodash.mergewith/-/lodash.mergewith-4.6.2.tgz#617121f89ac55f59047c7aec1ccd6654c6590f55"
+  integrity sha512-GK3g5RPZWTRSeLSpgP8Xhra+pnjBC56q9FZYe1d5RN3TJ35dbkGy3YqBSMbyCrlbi+CM9Z3Jk5yTL7RCsqboyQ==
+
 lodash.sortby@^4.7.0:
   version "4.7.0"
   resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"