diff --git a/types/geojson-precision/.npmignore b/types/geojson-precision/.npmignore
new file mode 100644
index 00000000000000..93e307400a5456
--- /dev/null
+++ b/types/geojson-precision/.npmignore
@@ -0,0 +1,5 @@
+*
+!**/*.d.ts
+!**/*.d.cts
+!**/*.d.mts
+!**/*.d.*.ts
diff --git a/types/geojson-precision/geojson-precision-tests.ts b/types/geojson-precision/geojson-precision-tests.ts
new file mode 100644
index 00000000000000..1da19490af5e90
--- /dev/null
+++ b/types/geojson-precision/geojson-precision-tests.ts
@@ -0,0 +1,14 @@
+import type { LineString, Point } from "geojson";
+import parse from "geojson-precision";
+
+const point: Point = { type: "Point", coordinates: [12.45, 56.78] };
+let line: LineString = { type: "LineString", coordinates: [] };
+
+let trimmed = parse(point, 3);
+// $ExpectType Point
+trimmed;
+
+line = parse(line, 4);
+line = parse.parse(line, 4);
+
+parse.parse.parse.parse.parse; // this is silly, but technically possible
diff --git a/types/geojson-precision/index.d.ts b/types/geojson-precision/index.d.ts
new file mode 100644
index 00000000000000..10c767f876eac1
--- /dev/null
+++ b/types/geojson-precision/index.d.ts
@@ -0,0 +1,26 @@
+import * as GeoJSON from "geojson";
+
+interface Parse {
+    /**
+     * Remove meaningless precision from your GeoJSON.
+     *
+     * @param coordinatePrecision A positive integer. If your specified precision value
+     *        is greater than the precision of the input geometry, the output precision
+     *        will be the same as the input. For example, if your input coordinates are
+     *        `[10.0, 20.0]`, and you specify a precision of `5`, the output will be the
+     *        same as the input.
+     *
+     * @param extrasPrecision A positive integer specifying extra coordinate precision
+     *        for things like the `z` value when the coordinate is
+     *        `[longitude, latitude, elevation]`.
+     */
+    <T extends GeoJSON.Geometry>(
+        geometry: T,
+        coordinatePrecision: number,
+        extrasPrecision?: number,
+    ): T;
+    parse: Parse;
+}
+
+declare const parse: Parse;
+export = parse;
diff --git a/types/geojson-precision/package.json b/types/geojson-precision/package.json
new file mode 100644
index 00000000000000..5bda3ae879e611
--- /dev/null
+++ b/types/geojson-precision/package.json
@@ -0,0 +1,20 @@
+{
+    "private": true,
+    "name": "@types/geojson-precision",
+    "version": "1.0.9999",
+    "projects": [
+        "https://github.com/jczaplew/geojson-precision"
+    ],
+    "dependencies": {
+        "@types/geojson": "*"
+    },
+    "devDependencies": {
+        "@types/geojson-precision": "workspace:."
+    },
+    "owners": [
+        {
+            "name": "Kyle Hensel",
+            "githubUsername": "k-yle"
+        }
+    ]
+}
diff --git a/types/geojson-precision/tsconfig.json b/types/geojson-precision/tsconfig.json
new file mode 100644
index 00000000000000..b514d4d6140cb4
--- /dev/null
+++ b/types/geojson-precision/tsconfig.json
@@ -0,0 +1,19 @@
+{
+    "compilerOptions": {
+        "module": "node16",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "geojson-precision-tests.ts"
+    ]
+}
diff --git a/types/markdown-it-container/index.d.ts b/types/markdown-it-container/index.d.ts
index 540a3baf9adbc6..87aafd33c0def0 100644
--- a/types/markdown-it-container/index.d.ts
+++ b/types/markdown-it-container/index.d.ts
@@ -1,10 +1,11 @@
 import MarkdownIt = require("markdown-it");
+import Renderer = require("markdown-it/lib/renderer");
 
 declare namespace MarkdownItContainer {
     interface ContainerOpts {
         marker?: string | undefined;
         validate?(params: string): boolean;
-        render?: MarkdownIt.Renderer.RenderRule | undefined;
+        render?: Renderer.RenderRule | undefined;
     }
 }
 
diff --git a/types/markdown-it-container/markdown-it-container-tests.ts b/types/markdown-it-container/markdown-it-container-tests.ts
index 42e1220908b72e..7b9e1276d3a0de 100644
--- a/types/markdown-it-container/markdown-it-container-tests.ts
+++ b/types/markdown-it-container/markdown-it-container-tests.ts
@@ -5,7 +5,7 @@ import MarkdownItContainer = require("markdown-it-container");
 const md = new MarkdownIt();
 
 md.use(MarkdownItContainer, "spoiler", {
-    validate: (params: any) => params.trim().match(/^spoiler\s+(.*)$/),
+    validate: (params: string) => params.trim().match(/^spoiler\s+(.*)$/),
     render: (tokens: MarkdownIt.Token[], index: number) => {
         const match = tokens[index].info.trim().match(/^spoiler\s+(.*)$/);
         const onClick = "this.parentNode.classList.toggle('_expanded');" + "event.preventDefault();";
@@ -26,6 +26,7 @@ md.use(MarkdownItContainer, "spoiler", {
             return "</div></div>\n";
         }
     },
+    marker: "marker",
 });
 
 const src = `:::spoiler This Is Spoiler Title
diff --git a/types/markdown-it-container/package.json b/types/markdown-it-container/package.json
index a1b6f8d6673ef6..dc089f647432bc 100644
--- a/types/markdown-it-container/package.json
+++ b/types/markdown-it-container/package.json
@@ -6,7 +6,7 @@
         "https://github.com/markdown-it/markdown-it-container"
     ],
     "dependencies": {
-        "@types/markdown-it": "*"
+        "@types/markdown-it": "<14"
     },
     "devDependencies": {
         "@types/markdown-it-container": "workspace:."