diff --git a/package-lock.json b/package-lock.json
index aa242d6e..21ee9a7d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -69,6 +69,7 @@
         "@storybook/theming": "^7.6.5",
         "@types/color": "^3.0.6",
         "@types/cors": "^2.8.17",
+        "@types/lodash.capitalize": "^4.2.9",
         "@types/lodash.isequal": "^4.5.8",
         "@types/lodash.throttle": "^4.1.9",
         "@types/react": "^16.14.52",
@@ -4732,6 +4733,15 @@
       "integrity": "sha512-OvlIYQK9tNneDlS0VN54LLd5uiPCBOp7gS5Z0f1mjoJYBrtStzgmJBxONW3U6OZqdtNzZPmn9BS/7WI7BFFcFQ==",
       "dev": true
     },
+    "node_modules/@types/lodash.capitalize": {
+      "version": "4.2.9",
+      "resolved": "https://registry.npmjs.org/@types/lodash.capitalize/-/lodash.capitalize-4.2.9.tgz",
+      "integrity": "sha512-SV1dav/WbuI816SVig4trFz8ID/m5maVzC8I/E/DejPvmlXvIhw7Y0GWxJ03UhU6qaZOj6qQnR1xxC0mP7ZXoQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/lodash": "*"
+      }
+    },
     "node_modules/@types/lodash.isequal": {
       "version": "4.5.8",
       "resolved": "https://registry.npmjs.org/@types/lodash.isequal/-/lodash.isequal-4.5.8.tgz",
diff --git a/package.json b/package.json
index 9c4be94b..8bf44847 100644
--- a/package.json
+++ b/package.json
@@ -98,6 +98,7 @@
     "@storybook/theming": "^7.6.5",
     "@types/color": "^3.0.6",
     "@types/cors": "^2.8.17",
+    "@types/lodash.capitalize": "^4.2.9",
     "@types/lodash.isequal": "^4.5.8",
     "@types/lodash.throttle": "^4.1.9",
     "@types/react": "^16.14.52",
diff --git a/src/components/Fieldset.tsx b/src/components/Fieldset.tsx
index 3b314e37..ab095064 100644
--- a/src/components/Fieldset.tsx
+++ b/src/components/Fieldset.tsx
@@ -1,11 +1,11 @@
-import React from 'react'
+import React, { ReactElement } from 'react'
 import FieldDocLabel from './FieldDocLabel'
 import Doc from './Doc'
 
 type FieldsetProps = {
   label: string,
   fieldSpec?: { doc?: string },
-  action?: string,
+  action?: ReactElement,
 };
 
 type FieldsetState = {
diff --git a/src/components/InputArray.tsx b/src/components/InputArray.tsx
index a0963ca1..ae4aa2da 100644
--- a/src/components/InputArray.tsx
+++ b/src/components/InputArray.tsx
@@ -2,7 +2,7 @@ import React from 'react'
 import InputString from './InputString'
 import InputNumber from './InputNumber'
 
-type FieldArrayProps = {
+export type FieldArrayProps = {
   value: string[]
   type?: string
   length?: number
diff --git a/src/components/InputAutocomplete.tsx b/src/components/InputAutocomplete.tsx
index e574aca3..fabaa16f 100644
--- a/src/components/InputAutocomplete.tsx
+++ b/src/components/InputAutocomplete.tsx
@@ -5,7 +5,7 @@ import Autocomplete from 'react-autocomplete'
 
 const MAX_HEIGHT = 140;
 
-type InputAutocompleteProps = {
+export type InputAutocompleteProps = {
   value?: string
   options: any[]
   onChange(...args: unknown[]): unknown
diff --git a/src/components/InputCheckbox.tsx b/src/components/InputCheckbox.tsx
index 55c9c758..a799e5a3 100644
--- a/src/components/InputCheckbox.tsx
+++ b/src/components/InputCheckbox.tsx
@@ -1,6 +1,6 @@
 import React from 'react'
 
-type InputCheckboxProps = {
+export type InputCheckboxProps = {
   value?: boolean
   style?: object
   onChange(...args: unknown[]): unknown
diff --git a/src/components/InputColor.tsx b/src/components/InputColor.tsx
index 7c919edd..ad1c6e76 100644
--- a/src/components/InputColor.tsx
+++ b/src/components/InputColor.tsx
@@ -9,7 +9,7 @@ function formatColor(color: ColorResult): string {
   return `rgba(${rgb.r}, ${rgb.g}, ${rgb.b}, ${rgb.a})`
 }
 
-type InputColorProps = {
+export type InputColorProps = {
   onChange(...args: unknown[]): unknown
   name?: string
   value?: string
diff --git a/src/components/InputDynamicArray.jsx b/src/components/InputDynamicArray.tsx
similarity index 70%
rename from src/components/InputDynamicArray.jsx
rename to src/components/InputDynamicArray.tsx
index bf353707..aef615f7 100644
--- a/src/components/InputDynamicArray.jsx
+++ b/src/components/InputDynamicArray.tsx
@@ -1,30 +1,34 @@
 import React from 'react'
-import PropTypes from 'prop-types'
+import capitalize from 'lodash.capitalize'
+import {MdDelete} from 'react-icons/md'
+
 import InputString from './InputString'
 import InputNumber from './InputNumber'
 import InputButton from './InputButton'
-import {MdDelete} from 'react-icons/md'
 import FieldDocLabel from './FieldDocLabel'
 import InputEnum from './InputEnum'
-import capitalize from 'lodash.capitalize'
 import InputUrl from './InputUrl'
 
 
-export default class FieldDynamicArray extends React.Component {
-  static propTypes = {
-    value: PropTypes.array,
-    type: PropTypes.string,
-    default: PropTypes.array,
-    onChange: PropTypes.func,
-    style: PropTypes.object,
-    fieldSpec: PropTypes.object,
-    'aria-label': PropTypes.string,
+export type FieldDynamicArrayProps = {
+  value?: (string | number)[]
+  type?: 'url' | 'number' | 'enum'
+  default?: (string | number)[]
+  onChange?(...args: unknown[]): unknown
+  style?: object
+  fieldSpec?: {
+    values?: any
   }
+  'aria-label'?: string
+  label: string
+};
 
-  changeValue(idx, newValue) {
+
+export default class FieldDynamicArray extends React.Component<FieldDynamicArrayProps> {
+  changeValue(idx: number, newValue: string | number) {
     const values = this.values.slice(0)
     values[idx] = newValue
-    this.props.onChange(values)
+    if (this.props.onChange) this.props.onChange(values)
   }
 
   get values() {
@@ -41,20 +45,20 @@ export default class FieldDynamicArray extends React.Component {
     }
     else if (this.props.type === 'enum') {
       const {fieldSpec} = this.props;
-      const defaultValue = Object.keys(fieldSpec.values)[0];
+      const defaultValue = Object.keys(fieldSpec!.values)[0];
       values.push(defaultValue);
     } else {
       values.push("")
     }
 
-    this.props.onChange(values)
+    if (this.props.onChange) this.props.onChange(values)
   }
 
-  deleteValue(valueIdx) {
+  deleteValue(valueIdx: number) {
     const values = this.values.slice(0)
     values.splice(valueIdx, 1)
 
-    this.props.onChange(values.length > 0 ? values : undefined);
+    if (this.props.onChange) this.props.onChange(values.length > 0 ? values : undefined);
   }
 
   render() {
@@ -63,30 +67,30 @@ export default class FieldDynamicArray extends React.Component {
       let input;
       if(this.props.type === 'url') {
         input = <InputUrl
-          value={v}
+          value={v as string}
           onChange={this.changeValue.bind(this, i)}
           aria-label={this.props['aria-label'] || this.props.label}
         />
       }
       else if (this.props.type === 'number') {
         input = <InputNumber
-          value={v}
+          value={v as number}
           onChange={this.changeValue.bind(this, i)}
           aria-label={this.props['aria-label'] || this.props.label}
         />
       }
       else if (this.props.type === 'enum') {
-        const options = Object.keys(this.props.fieldSpec.values).map(v => [v, capitalize(v)]);
+        const options = Object.keys(this.props.fieldSpec?.values).map(v => [v, capitalize(v)]);
         input = <InputEnum
           options={options}
-          value={v}
+          value={v as string}
           onChange={this.changeValue.bind(this, i)}
           aria-label={this.props['aria-label'] || this.props.label}
         />
       }
       else {
         input = <InputString
-          value={v}
+          value={v as string}
           onChange={this.changeValue.bind(this, i)}
           aria-label={this.props['aria-label'] || this.props.label}
         />
@@ -120,11 +124,11 @@ export default class FieldDynamicArray extends React.Component {
   }
 }
 
-class DeleteValueInputButton extends React.Component {
-  static propTypes = {
-    onClick: PropTypes.func,
-  }
+type DeleteValueInputButtonProps = {
+  onClick?(...args: unknown[]): unknown
+};
 
+class DeleteValueInputButton extends React.Component<DeleteValueInputButtonProps> {
   render() {
     return <InputButton
       className="maputnik-delete-stop"
@@ -133,7 +137,7 @@ class DeleteValueInputButton extends React.Component {
     >
       <FieldDocLabel
         label={<MdDelete />}
-        doc={"Remove array item."}
+        fieldSpec={{doc:" Remove array item."}}
       />
     </InputButton>
   }
diff --git a/src/components/InputEnum.tsx b/src/components/InputEnum.tsx
index 93b1dece..a8f40d3f 100644
--- a/src/components/InputEnum.tsx
+++ b/src/components/InputEnum.tsx
@@ -17,7 +17,7 @@ export type InputEnumProps = {
   value?: string
   style?: object
   default?: string
-  name: string
+  name?: string
   onChange(...args: unknown[]): unknown
   options: any[]
   'aria-label'?: string
diff --git a/src/components/InputFont.tsx b/src/components/InputFont.tsx
index b015a8ed..7bdaf9fa 100644
--- a/src/components/InputFont.tsx
+++ b/src/components/InputFont.tsx
@@ -1,7 +1,7 @@
 import React from 'react'
 import InputAutocomplete from './InputAutocomplete'
 
-type FieldFontProps = {
+export type FieldFontProps = {
   name: string
   value?: string[]
   default?: string[]
diff --git a/src/components/InputMultiInput.tsx b/src/components/InputMultiInput.tsx
index 632b8c3b..f58bbcc6 100644
--- a/src/components/InputMultiInput.tsx
+++ b/src/components/InputMultiInput.tsx
@@ -2,7 +2,7 @@ import React from 'react'
 import classnames from 'classnames'
 
 type InputMultiInputProps = {
-  name: string
+  name?: string
   value: string
   options: any[]
   onChange(...args: unknown[]): unknown
diff --git a/src/components/InputNumber.tsx b/src/components/InputNumber.tsx
index c7b044df..eb7d6e18 100644
--- a/src/components/InputNumber.tsx
+++ b/src/components/InputNumber.tsx
@@ -2,7 +2,7 @@ import React, { BaseSyntheticEvent } from 'react'
 
 let IDX = 0;
 
-type InputNumberProps = {
+export type InputNumberProps = {
   value?: number
   default?: number
   min?: number
diff --git a/src/components/InputSpec.jsx b/src/components/InputSpec.jsx
deleted file mode 100644
index 021a9787..00000000
--- a/src/components/InputSpec.jsx
+++ /dev/null
@@ -1,139 +0,0 @@
-import React from 'react'
-import PropTypes from 'prop-types'
-
-import InputColor from './InputColor'
-import InputNumber from './InputNumber'
-import InputCheckbox from './InputCheckbox'
-import InputString from './InputString'
-import InputSelect from './InputSelect'
-import InputMultiInput from './InputMultiInput'
-import InputArray from './InputArray'
-import InputDynamicArray from './InputDynamicArray'
-import InputFont from './InputFont'
-import InputAutocomplete from './InputAutocomplete'
-import InputEnum from './InputEnum'
-import capitalize from 'lodash.capitalize'
-
-const iconProperties = ['background-pattern', 'fill-pattern', 'line-pattern', 'fill-extrusion-pattern', 'icon-image']
-
-function labelFromFieldName(fieldName) {
-  let label = fieldName.split('-').slice(1).join(' ')
-  if(label.length > 0) {
-    label = label.charAt(0).toUpperCase() + label.slice(1);
-  }
-  return label
-}
-
-function optionsLabelLength(options) {
-  let sum = 0;
-  options.forEach(([_, label]) => {
-    sum += label.length
-  })
-  return sum
-}
-
-/** Display any field from the Maplibre GL style spec and
- * choose the correct field component based on the @{fieldSpec}
- * to display @{value}. */
-export default class SpecField extends React.Component {
-  static propTypes = {
-    onChange: PropTypes.func.isRequired,
-    fieldName: PropTypes.string.isRequired,
-    fieldSpec: PropTypes.object.isRequired,
-    value: PropTypes.oneOfType([
-      PropTypes.string,
-      PropTypes.number,
-      PropTypes.array,
-      PropTypes.bool
-    ]),
-    /** Override the style of the field */
-    style: PropTypes.object,
-    'aria-label': PropTypes.string,
-  }
-
-  render() {
-    const commonProps = {
-      error: this.props.error,
-      fieldSpec: this.props.fieldSpec,
-      label: this.props.label,
-      action: this.props.action,
-      style: this.props.style,
-      value: this.props.value,
-      default: this.props.fieldSpec.default,
-      name: this.props.fieldName,
-      onChange: newValue => this.props.onChange(this.props.fieldName, newValue),
-      'aria-label': this.props['aria-label'],
-    }
-
-    function childNodes() {
-      switch(this.props.fieldSpec.type) {
-        case 'number': return (
-          <InputNumber
-            {...commonProps}
-            min={this.props.fieldSpec.minimum}
-            max={this.props.fieldSpec.maximum}
-          />
-        )
-        case 'enum':
-          const options = Object.keys(this.props.fieldSpec.values).map(v => [v, capitalize(v)])
-
-          return <InputEnum
-            {...commonProps}
-            options={options}
-          />
-        case 'resolvedImage':
-        case 'formatted':
-        case 'string':
-          if (iconProperties.indexOf(this.props.fieldName) >= 0) {
-            const options = this.props.fieldSpec.values || [];
-            return <InputAutocomplete
-              {...commonProps}
-              options={options.map(f => [f, f])}
-            />
-          } else {
-            return <InputString
-              {...commonProps}
-            />
-          }
-        case 'color': return (
-          <InputColor
-            {...commonProps}
-          />
-        )
-        case 'boolean': return (
-          <InputCheckbox
-            {...commonProps}
-          />
-        )
-        case 'array':
-          if(this.props.fieldName === 'text-font') {
-            return <InputFont
-              {...commonProps}
-              fonts={this.props.fieldSpec.values}
-            />
-          } else {
-            if (this.props.fieldSpec.length) {
-              return <InputArray
-                {...commonProps}
-                type={this.props.fieldSpec.value}
-                length={this.props.fieldSpec.length}
-              />
-            } else {
-              return <InputDynamicArray
-                {...commonProps}
-                fieldSpec={this.props.fieldSpec}
-                type={this.props.fieldSpec.value}
-              />
-            }
-          }
-        default: return null
-      }
-    }
-
-    return (
-      <div data-wd-key={"spec-field:"+this.props.fieldName}>
-        {childNodes.call(this)}
-      </div>
-    );
-  }
-}
diff --git a/src/components/InputSpec.tsx b/src/components/InputSpec.tsx
new file mode 100644
index 00000000..f79bb4da
--- /dev/null
+++ b/src/components/InputSpec.tsx
@@ -0,0 +1,126 @@
+import React, { ReactElement } from 'react'
+
+import InputColor, { InputColorProps } from './InputColor'
+import InputNumber, { InputNumberProps } from './InputNumber'
+import InputCheckbox, { InputCheckboxProps } from './InputCheckbox'
+import InputString, { InputStringProps } from './InputString'
+import InputArray, { FieldArrayProps } from './InputArray'
+import InputDynamicArray, { FieldDynamicArrayProps } from './InputDynamicArray'
+import InputFont, { FieldFontProps } from './InputFont'
+import InputAutocomplete, { InputAutocompleteProps } from './InputAutocomplete'
+import InputEnum, { InputEnumProps } from './InputEnum'
+import capitalize from 'lodash.capitalize'
+
+const iconProperties = ['background-pattern', 'fill-pattern', 'line-pattern', 'fill-extrusion-pattern', 'icon-image']
+
+export type SpecFieldProps = {
+  onChange(...args: unknown[]): unknown
+  fieldName: string
+  fieldSpec: {
+    default?: unknown
+    type: 'number' | 'enum' | 'resolvedImage' | 'formatted' | 'string' | 'color' | 'boolean' | 'array'
+    minimum?: number
+    maximum?: number
+    values?: unknown[]
+    length?: number
+    value?: string
+  }
+  value?: string | number | unknown[] | boolean
+  /** Override the style of the field */
+  style?: object
+  'aria-label'?: string
+  error: unknown[]
+  label: string
+  action: ReactElement
+};
+
+/** Display any field from the Maplibre GL style spec and
+ * choose the correct field component based on the @{fieldSpec}
+ * to display @{value}. */
+export default class SpecField extends React.Component<SpecFieldProps> {
+
+  childNodes() {
+    const commonProps = {
+      error: this.props.error,
+      fieldSpec: this.props.fieldSpec,
+      label: this.props.label,
+      action: this.props.action,
+      style: this.props.style,
+      value: this.props.value,
+      default: this.props.fieldSpec.default,
+      name: this.props.fieldName,
+      onChange: (newValue: string) => this.props.onChange(this.props.fieldName, newValue),
+      'aria-label': this.props['aria-label'],
+    }
+    switch(this.props.fieldSpec.type) {
+      case 'number': return (
+        <InputNumber
+          {...commonProps as InputNumberProps}
+          min={this.props.fieldSpec.minimum}
+          max={this.props.fieldSpec.maximum}
+        />
+      )
+      case 'enum':
+        const options = Object.keys(this.props.fieldSpec.values || []).map(v => [v, capitalize(v)])
+
+        return <InputEnum
+          {...commonProps as Omit<InputEnumProps, "options">}
+          options={options}
+        />
+      case 'resolvedImage':
+      case 'formatted':
+      case 'string':
+        if (iconProperties.indexOf(this.props.fieldName) >= 0) {
+          const options = this.props.fieldSpec.values || [];
+          return <InputAutocomplete
+            {...commonProps as Omit<InputAutocompleteProps, "options">}
+            options={options.map(f => [f, f])}
+          />
+        } else {
+          return <InputString
+            {...commonProps as InputStringProps}
+          />
+        }
+      case 'color': return (
+        <InputColor
+          {...commonProps as InputColorProps}
+        />
+      )
+      case 'boolean': return (
+        <InputCheckbox
+          {...commonProps as InputCheckboxProps}
+        />
+      )
+      case 'array':
+        if(this.props.fieldName === 'text-font') {
+          return <InputFont
+            {...commonProps as FieldFontProps}
+            fonts={this.props.fieldSpec.values}
+          />
+        } else {
+          if (this.props.fieldSpec.length) {
+            return <InputArray
+              {...commonProps as FieldArrayProps}
+              type={this.props.fieldSpec.value}
+              length={this.props.fieldSpec.length}
+            />
+          } else {
+            return <InputDynamicArray
+              {...commonProps as FieldDynamicArrayProps}
+              fieldSpec={this.props.fieldSpec}
+              type={this.props.fieldSpec.value as FieldDynamicArrayProps['type']}
+            />
+          }
+        }
+      default: return null
+    }
+  }
+
+  render() {
+    return (
+      <div data-wd-key={"spec-field:"+this.props.fieldName}>
+        {this.childNodes()}
+      </div>
+    );
+  }
+}
diff --git a/src/components/InputString.tsx b/src/components/InputString.tsx
index b00ecc26..ee1d0bc6 100644
--- a/src/components/InputString.tsx
+++ b/src/components/InputString.tsx
@@ -6,7 +6,7 @@ export type InputStringProps = {
   style?: object
   default?: string
   onChange?(...args: unknown[]): unknown
-  onInput(...args: unknown[]): unknown
+  onInput?(...args: unknown[]): unknown
   multi?: boolean
   required?: boolean
   disabled?: boolean
@@ -77,7 +77,7 @@ export default class InputString extends React.Component<InputStringProps, Input
           editing: true,
           value: e.target.value
         }, () => {
-          this.props.onInput(this.state.value);
+          if (this.props.onInput) this.props.onInput(this.state.value);
         });
       },
       onBlur: () => {
diff --git a/src/components/SpecField.jsx b/src/components/SpecField.tsx
similarity index 71%
rename from src/components/SpecField.jsx
rename to src/components/SpecField.tsx
index cb55031e..c399cb83 100644
--- a/src/components/SpecField.jsx
+++ b/src/components/SpecField.tsx
@@ -1,13 +1,12 @@
 import React from 'react'
-import PropTypes from 'prop-types'
 import Block from './Block'
-import InputSpec from './InputSpec'
+import InputSpec, { SpecFieldProps as InputFieldSpecProps } from './InputSpec'
 import Fieldset from './Fieldset'
 
 
 const typeMap = {
   color: () => Block,
-  enum: ({fieldSpec}) => (Object.keys(fieldSpec.values).length <= 3 ? Fieldset : Block),
+  enum: ({fieldSpec}: any) => (Object.keys(fieldSpec.values).length <= 3 ? Fieldset : Block),
   boolean: () => Block,
   array: () => Fieldset,
   resolvedImage: () => Block,
@@ -16,12 +15,11 @@ const typeMap = {
   formatted: () => Block,
 };
 
-export default class SpecField extends React.Component {
-  static propTypes = {
-    ...InputSpec.propTypes,
-    name: PropTypes.string,
-  }
+type SpecFieldProps = InputFieldSpecProps & {
+  name?: string
+};
 
+export default class SpecField extends React.Component<SpecFieldProps> {
   render() {
     const {props} = this;