diff --git a/quartz/plugins/transformers/citations.ts b/quartz/plugins/transformers/citations.ts
index bb302e4..5242f37 100644
--- a/quartz/plugins/transformers/citations.ts
+++ b/quartz/plugins/transformers/citations.ts
@@ -17,7 +17,7 @@ const defaultOptions: Options = {
   csl: "apa",
 }
 
-export const Citations: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+export const Citations: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "Citations",
@@ -38,7 +38,7 @@ export const Citations: QuartzTransformerPlugin<Partial<Options> | undefined> =
       // using https://github.com/syntax-tree/unist-util-visit as they're just anochor links
       plugins.push(() => {
         return (tree, _file) => {
-          visit(tree, "element", (node, index, parent) => {
+          visit(tree, "element", (node, _index, _parent) => {
             if (node.tagName === "a" && node.properties?.href?.startsWith("#bib")) {
               node.properties["data-no-popover"] = true
             }
diff --git a/quartz/plugins/transformers/description.ts b/quartz/plugins/transformers/description.ts
index 5900745..c7e592e 100644
--- a/quartz/plugins/transformers/description.ts
+++ b/quartz/plugins/transformers/description.ts
@@ -18,7 +18,7 @@ const urlRegex = new RegExp(
   "g",
 )
 
-export const Description: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+export const Description: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "Description",
diff --git a/quartz/plugins/transformers/frontmatter.ts b/quartz/plugins/transformers/frontmatter.ts
index 5ab239a..70a60d8 100644
--- a/quartz/plugins/transformers/frontmatter.ts
+++ b/quartz/plugins/transformers/frontmatter.ts
@@ -40,7 +40,7 @@ function coerceToArray(input: string | string[]): string[] | undefined {
     .map((tag: string | number) => tag.toString())
 }
 
-export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+export const FrontMatter: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "FrontMatter",
diff --git a/quartz/plugins/transformers/gfm.ts b/quartz/plugins/transformers/gfm.ts
index 48681ff..eec26f7 100644
--- a/quartz/plugins/transformers/gfm.ts
+++ b/quartz/plugins/transformers/gfm.ts
@@ -14,9 +14,7 @@ const defaultOptions: Options = {
   linkHeadings: true,
 }
 
-export const GitHubFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const GitHubFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "GitHubFlavoredMarkdown",
diff --git a/quartz/plugins/transformers/lastmod.ts b/quartz/plugins/transformers/lastmod.ts
index 2c7b9ce..fe8c01b 100644
--- a/quartz/plugins/transformers/lastmod.ts
+++ b/quartz/plugins/transformers/lastmod.ts
@@ -27,9 +27,7 @@ function coerceDate(fp: string, d: any): Date {
 }
 
 type MaybeDate = undefined | string | number
-export const CreatedModifiedDate: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const CreatedModifiedDate: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "CreatedModifiedDate",
diff --git a/quartz/plugins/transformers/latex.ts b/quartz/plugins/transformers/latex.ts
index 757333a..28b4d50 100644
--- a/quartz/plugins/transformers/latex.ts
+++ b/quartz/plugins/transformers/latex.ts
@@ -12,7 +12,7 @@ interface MacroType {
   [key: string]: string
 }
 
-export const Latex: QuartzTransformerPlugin<Options> = (opts?: Options) => {
+export const Latex: QuartzTransformerPlugin<Partial<Options>> = (opts) => {
   const engine = opts?.renderEngine ?? "katex"
   const macros = opts?.customMacros ?? {}
   return {
diff --git a/quartz/plugins/transformers/links.ts b/quartz/plugins/transformers/links.ts
index 2805818..b6a2c91 100644
--- a/quartz/plugins/transformers/links.ts
+++ b/quartz/plugins/transformers/links.ts
@@ -8,7 +8,6 @@ import {
   simplifySlug,
   splitAnchor,
   transformLink,
-  joinSegments,
 } from "../../util/path"
 import path from "path"
 import { visit } from "unist-util-visit"
@@ -33,7 +32,7 @@ const defaultOptions: Options = {
   externalLinkIcon: true,
 }
 
-export const CrawlLinks: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
+export const CrawlLinks: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "LinkProcessing",
diff --git a/quartz/plugins/transformers/ofm.ts b/quartz/plugins/transformers/ofm.ts
index a406c86..0dea893 100644
--- a/quartz/plugins/transformers/ofm.ts
+++ b/quartz/plugins/transformers/ofm.ts
@@ -136,9 +136,7 @@ const wikilinkImageEmbedRegex = new RegExp(
   /^(?<alt>(?!^\d*x?\d*$).*?)?(\|?\s*?(?<width>\d+)(x(?<height>\d+))?)?$/,
 )
 
-export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
 
   const mdastToHtml = (ast: PhrasingContent | Paragraph) => {
diff --git a/quartz/plugins/transformers/oxhugofm.ts b/quartz/plugins/transformers/oxhugofm.ts
index 6e70bb1..cdbffcf 100644
--- a/quartz/plugins/transformers/oxhugofm.ts
+++ b/quartz/plugins/transformers/oxhugofm.ts
@@ -47,9 +47,7 @@ const quartzLatexRegex = new RegExp(/\$\$[\s\S]*?\$\$|\$.*?\$/, "g")
  * markdown to make it compatible with quartz but the list of changes applied it
  * is not exhaustive.
  * */
-export const OxHugoFlavouredMarkdown: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const OxHugoFlavouredMarkdown: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "OxHugoFlavouredMarkdown",
diff --git a/quartz/plugins/transformers/syntax.ts b/quartz/plugins/transformers/syntax.ts
index f11734e..5d3aae0 100644
--- a/quartz/plugins/transformers/syntax.ts
+++ b/quartz/plugins/transformers/syntax.ts
@@ -19,10 +19,8 @@ const defaultOptions: Options = {
   keepBackground: false,
 }
 
-export const SyntaxHighlighting: QuartzTransformerPlugin<Options> = (
-  userOpts?: Partial<Options>,
-) => {
-  const opts: Partial<CodeOptions> = { ...defaultOptions, ...userOpts }
+export const SyntaxHighlighting: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
+  const opts: CodeOptions = { ...defaultOptions, ...userOpts }
 
   return {
     name: "SyntaxHighlighting",
diff --git a/quartz/plugins/transformers/toc.ts b/quartz/plugins/transformers/toc.ts
index bfc2f98..791547b 100644
--- a/quartz/plugins/transformers/toc.ts
+++ b/quartz/plugins/transformers/toc.ts
@@ -25,9 +25,7 @@ interface TocEntry {
 }
 
 const slugAnchor = new Slugger()
-export const TableOfContents: QuartzTransformerPlugin<Partial<Options> | undefined> = (
-  userOpts,
-) => {
+export const TableOfContents: QuartzTransformerPlugin<Partial<Options>> = (userOpts) => {
   const opts = { ...defaultOptions, ...userOpts }
   return {
     name: "TableOfContents",