diff --git a/packages/gatsby-plugin-typescript/src/__tests__/gatsby-node.js b/packages/gatsby-plugin-typescript/src/__tests__/gatsby-node.js
index 1dce01b41caf1..989f0c17446f9 100644
--- a/packages/gatsby-plugin-typescript/src/__tests__/gatsby-node.js
+++ b/packages/gatsby-plugin-typescript/src/__tests__/gatsby-node.js
@@ -95,6 +95,9 @@ describe(`gatsby-plugin-typescript`, () => {
         isTSX: false,
         jsxPragma: `ReactFunction`,
         allExtensions: false,
+        allowNamespaces: false,
+        allowDeclareFields: false,
+        onlyRemoveTypeImports: false,
       })
 
       expect(isValid).toBe(true)
diff --git a/packages/gatsby-plugin-typescript/src/gatsby-node.js b/packages/gatsby-plugin-typescript/src/gatsby-node.js
index 3c60f83a40363..0ccfe8c41fe28 100644
--- a/packages/gatsby-plugin-typescript/src/gatsby-node.js
+++ b/packages/gatsby-plugin-typescript/src/gatsby-node.js
@@ -41,10 +41,29 @@ exports.pluginOptionsSchema = ({ Joi }) =>
     jsxPragma: Joi.string()
       .description(`Replace the function used when compiling JSX expressions.`)
       .default(`React`),
+    jsxPragmaFrag: Joi.string()
+      .description(
+        `Replace the function used when compiling JSX fragment expressions.`
+      )
+      .optional(),
     allExtensions: Joi.boolean()
       .description(`Indicates that every file should be parsed as TS or TSX.`)
       .default(false)
       .when(`isTSX`, { is: true, then: Joi.valid(true) }),
+    allowNamespaces: Joi.boolean()
+      .description(`Enables compilation of TypeScript namespaces.`)
+      .optional(),
+    allowDeclareFields: Joi.boolean()
+      .description(
+        `When enabled, type-only class fields are only removed if they are prefixed with the declare modifier.`
+      )
+      .optional(),
+    onlyRemoveTypeImports: Joi.boolean()
+      .description(
+        `When set to true, the transform will only remove type-only imports (introduced in TypeScript 3.8).` +
+          `This should only be used if you are using TypeScript >= 3.8.`
+      )
+      .optional(),
   })
 
 exports.resolvableExtensions = resolvableExtensions