diff --git a/dist/index.js b/dist/index.js
index 08d8dca..502f184 100755
--- a/dist/index.js
+++ b/dist/index.js
@@ -37,9 +37,6 @@ async function fromURL(url, email = "", password = "") {
   return result.items;
 }
 
-// src/lib.ts
-import { promises as fs2 } from "fs";
-
 // src/utils.ts
 function toPascalCase(str) {
   if (/^[\p{L}\d]+$/iu.test(str)) {
@@ -50,8 +47,17 @@ function toPascalCase(str) {
     (g0, g1, g2) => g1.toUpperCase() + g2.toLowerCase()
   ).replace(/[^\p{L}\d]/giu, "");
 }
+function sanitizeFieldName(name) {
+  if (!isNaN(parseFloat(name.charAt(0)))) {
+    console.log({ found: name, return: `"${name}"` });
+    return `"${name}"`;
+  } else {
+    return name;
+  }
+}
 
 // src/lib.ts
+import { promises as fs2 } from "fs";
 var pbSchemaTypescriptMap = {
   text: "string",
   number: "number",
@@ -61,8 +67,7 @@ var pbSchemaTypescriptMap = {
   date: "string",
   select: "string",
   json: "null | unknown",
-  file: "string",
-  files: "string[]",
+  file: (opts) => opts.maxSelect && opts.maxSelect > 1 ? "string[]" : "string",
   relation: "string",
   user: "string"
 };
@@ -107,20 +112,20 @@ function createCollectionRecord(collectionNames) {
 function createRecordType(name, schema) {
   let typeString = `export type ${toPascalCase(name)}Record = {
 `;
-  schema.forEach((field) => {
-    const pbType = field.type === "file" && field.options.maxSelect && field.options.maxSelect > 1 ? "files" : field.type;
-    typeString += createTypeField(field.name, field.required, pbType);
+  schema.forEach((recordSchema) => {
+    typeString += createTypeField(recordSchema);
   });
   typeString += `}`;
   return typeString;
 }
-function createTypeField(name, required, pbType) {
-  if (pbType in pbSchemaTypescriptMap) {
-    return `	${name}${required ? "" : "?"}: ${pbSchemaTypescriptMap[pbType]}
-`;
-  } else {
-    throw new Error(`unknown type ${pbType} found in schema`);
+function createTypeField(recordSchema) {
+  if (!(recordSchema.type in pbSchemaTypescriptMap)) {
+    throw new Error(`unknown type ${recordSchema.type} found in schema`);
   }
+  const typeStringOrFunc = pbSchemaTypescriptMap[recordSchema.type];
+  const typeString = typeof typeStringOrFunc === "function" ? typeStringOrFunc(recordSchema.options) : typeStringOrFunc;
+  return `	${sanitizeFieldName(recordSchema.name)}${recordSchema.required ? "" : "?"}: ${typeString}
+`;
 }
 async function saveFile(outPath, typeString) {
   await fs2.writeFile(outPath, typeString, "utf8");
diff --git a/src/lib.ts b/src/lib.ts
index bb0186d..17e4791 100644
--- a/src/lib.ts
+++ b/src/lib.ts
@@ -1,7 +1,7 @@
 import { CollectionRecord, RecordOptions, RecordSchema } from "./types"
+import { sanitizeFieldName, toPascalCase } from "./utils"
 
 import { promises as fs } from "fs"
-import { toPascalCase } from "./utils"
 
 const pbSchemaTypescriptMap = {
   text: "string",
@@ -81,7 +81,7 @@ export function createTypeField(recordSchema: RecordSchema) {
     typeof typeStringOrFunc === "function"
       ? typeStringOrFunc(recordSchema.options)
       : typeStringOrFunc
-  return `\t${recordSchema.name}${
+  return `\t${sanitizeFieldName(recordSchema.name)}${
     recordSchema.required ? "" : "?"
   }: ${typeString}\n`
 }
diff --git a/src/utils.ts b/src/utils.ts
index 3884328..52389b8 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -10,3 +10,13 @@ export function toPascalCase(str: string) {
     )
     .replace(/[^\p{L}\d]/giu, "")
 }
+
+export function sanitizeFieldName(name: string) {
+  // If the first character is a number, wrap it in quotes to pass typecheck
+  if (!isNaN(parseFloat(name.charAt(0)))) {
+    console.log({ found: name, return: `"${name}"` })
+    return `"${name}"`
+  } else {
+    return name
+  }
+}
diff --git a/test/utils.test.ts b/test/utils.test.ts
index 3142c47..f71781d 100644
--- a/test/utils.test.ts
+++ b/test/utils.test.ts
@@ -1,17 +1,24 @@
-import { toPascalCase } from "../src/utils"
+import { sanitizeFieldName, toPascalCase } from "../src/utils"
 
 describe("toPascalCase", () => {
-	it("return pascal case string", () => {
-		expect(toPascalCase("foo bar")).toEqual("FooBar")
-		expect(toPascalCase("Foo Bar")).toEqual("FooBar")
-		expect(toPascalCase("fooBar")).toEqual("FooBar")
-		expect(toPascalCase("FooBar")).toEqual("FooBar")
-		expect(toPascalCase("--foo-bar--")).toEqual("FooBar")
-		expect(toPascalCase("__FOO_BAR__")).toEqual("FooBar")
-		expect(toPascalCase("!--foo-¿?-bar--121-**%")).toEqual("FooBar121")
-		expect(toPascalCase("Here i am")).toEqual("HereIAm")
-		expect(toPascalCase("FOO BAR")).toEqual("FooBar")
-		expect(toPascalCase("ça.roule")).toEqual("ÇaRoule")
-		expect(toPascalCase("добрий-день")).toEqual("ДобрийДень")
-	})
+  it("return pascal case string", () => {
+    expect(toPascalCase("foo bar")).toEqual("FooBar")
+    expect(toPascalCase("Foo Bar")).toEqual("FooBar")
+    expect(toPascalCase("fooBar")).toEqual("FooBar")
+    expect(toPascalCase("FooBar")).toEqual("FooBar")
+    expect(toPascalCase("--foo-bar--")).toEqual("FooBar")
+    expect(toPascalCase("__FOO_BAR__")).toEqual("FooBar")
+    expect(toPascalCase("!--foo-¿?-bar--121-**%")).toEqual("FooBar121")
+    expect(toPascalCase("Here i am")).toEqual("HereIAm")
+    expect(toPascalCase("FOO BAR")).toEqual("FooBar")
+    expect(toPascalCase("ça.roule")).toEqual("ÇaRoule")
+    expect(toPascalCase("добрий-день")).toEqual("ДобрийДень")
+  })
+})
+
+describe("sanitizeFieldName", () => {
+  it("returns valid typescript fields", () => {
+    expect(sanitizeFieldName("foo_bar")).toEqual("foo_bar")
+    expect(sanitizeFieldName("4number")).toEqual('"4number"')
+  })
 })