From edc6c29479f9b8c3e54d38b91f5e199e3e9117db Mon Sep 17 00:00:00 2001
From: Dimitri POSTOLOV <dmytropostolov@gmail.com>
Date: Wed, 2 Oct 2024 22:27:30 +0200
Subject: [PATCH] remove `truthy()` helper function (#3341)

---
 .changeset/loud-coins-pull.md                             | 5 +++++
 .gitignore                                                | 1 +
 packages/nextra/src/server/compile.ts                     | 8 ++++----
 packages/nextra/src/server/page-map.ts                    | 5 ++---
 .../src/server/remark-plugins/remark-static-image.ts      | 3 +--
 packages/nextra/src/server/utils.ts                       | 6 ------
 6 files changed, 13 insertions(+), 15 deletions(-)
 create mode 100644 .changeset/loud-coins-pull.md

diff --git a/.changeset/loud-coins-pull.md b/.changeset/loud-coins-pull.md
new file mode 100644
index 0000000000..d64e3c70f1
--- /dev/null
+++ b/.changeset/loud-coins-pull.md
@@ -0,0 +1,5 @@
+---
+'nextra': patch
+---
+
+remove `truthy()` helper function
diff --git a/.gitignore b/.gitignore
index 346b276368..f9136cb436 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 .DS_Store
 .next/
+.tsup/
 node_modules/
 *.log
 dist/
diff --git a/packages/nextra/src/server/compile.ts b/packages/nextra/src/server/compile.ts
index 7825079f6f..95408e5c66 100644
--- a/packages/nextra/src/server/compile.ts
+++ b/packages/nextra/src/server/compile.ts
@@ -51,7 +51,7 @@ import {
   remarkStaticImage,
   remarkStructurize
 } from './remark-plugins/index.js'
-import { logger, truthy } from './utils.js'
+import { logger } from './utils.js'
 
 const cachedCompilerForFormat: Record<
   Exclude<ProcessorOptions['format'], undefined | null>,
@@ -252,7 +252,7 @@ export async function compileMdx(
           }
         ] satisfies Pluggable,
         remarkSmartypants
-      ].filter(truthy),
+      ].filter(v => !!v),
       rehypePlugins: [
         ...(rehypePlugins || []),
         format === 'md' && [
@@ -295,7 +295,7 @@ export async function compileMdx(
               rehypeAttachCodeMeta
             ]),
         [rehypeExtractTocContent, { isRemoteContent }]
-      ].filter(truthy),
+      ].filter(v => !!v),
       recmaPlugins: [
         (() => (ast: Program, file) => {
           const mdxContentIndex = ast.body.findIndex(node => {
@@ -347,7 +347,7 @@ export async function compileMdx(
         }) satisfies Plugin<[], Program>,
         isRemoteContent ? recmaRewriteFunctionBody : recmaRewriteJsx,
         ...(recmaPlugins || [])
-      ].filter(truthy)
+      ].filter(v => !!v)
     })
   }
 }
diff --git a/packages/nextra/src/server/page-map.ts b/packages/nextra/src/server/page-map.ts
index 49905ccfeb..a642e60d65 100644
--- a/packages/nextra/src/server/page-map.ts
+++ b/packages/nextra/src/server/page-map.ts
@@ -20,8 +20,7 @@ import {
   createAstExportConst,
   createAstObject,
   normalizePageRoute,
-  pageTitleFromFilename,
-  truthy
+  pageTitleFromFilename
 } from './utils.js'
 
 const fs = gracefulFs.promises
@@ -164,7 +163,7 @@ async function collectFiles({
       })
     })
 
-  const pageMap = (await Promise.all(promises)).filter(truthy)
+  const pageMap = (await Promise.all(promises)).filter(v => !!v)
 
   return {
     // @ts-expect-error -- fixme
diff --git a/packages/nextra/src/server/remark-plugins/remark-static-image.ts b/packages/nextra/src/server/remark-plugins/remark-static-image.ts
index 7e81bcf47f..5f5fa8d13c 100644
--- a/packages/nextra/src/server/remark-plugins/remark-static-image.ts
+++ b/packages/nextra/src/server/remark-plugins/remark-static-image.ts
@@ -5,7 +5,6 @@ import slash from 'slash'
 import type { Plugin } from 'unified'
 import { visit } from 'unist-util-visit'
 import { EXTERNAL_URL_REGEX, PUBLIC_DIR } from '../constants.js'
-import { truthy } from '../utils.js'
 
 /**
  * @link https://github.com/vercel/next.js/blob/6cfebfb02c2a52a1f99fca59a2eac2d704d053db/packages/next/build/webpack/loaders/next-image-loader.js#L6
@@ -99,7 +98,7 @@ export const remarkStaticImage: Plugin<[], Root> = () => ast => {
             }
           }
         }
-      ].filter(truthy)
+      ].filter(v => !!v)
     })
   }
 
diff --git a/packages/nextra/src/server/utils.ts b/packages/nextra/src/server/utils.ts
index 18c335f554..b8f5c5da0c 100644
--- a/packages/nextra/src/server/utils.ts
+++ b/packages/nextra/src/server/utils.ts
@@ -9,12 +9,6 @@ import slash from 'slash'
 import title from 'title'
 import { DEFAULT_PROPERTY_PROPS } from './constants.js'
 
-type Truthy<T> = T extends false | '' | 0 | null | undefined ? never : T // from lodash
-
-export function truthy<T>(value: T): value is Truthy<T> {
-  return !!value
-}
-
 export const logger = {
   info: console.log.bind(null, '-', '\x1b[36minfo\x1b[0m', '[nextra]'),
   warn: console.log.bind(null, '-', '\x1b[33mwarn\x1b[0m', '[nextra]'),