@uppy/form: move internal property to private field (#5214)

packages/@uppy/form/src/index.ts

@@ -50,7 +50,7 @@ export default class Form<M extends Meta, B extends Body> extends BasePlugin<
 > {
   static VERSION = packageJson.version
 
-  form: HTMLFormElement // TODO: make this private (or at least, mark it as readonly)
+  #form: HTMLFormElement
 
   /**
    * Unfortunately Uppy isn't a state machine in which we can guarantee it's
@@ -84,7 +84,7 @@ export default class Form<M extends Meta, B extends Body> extends BasePlugin<
     }
 
     if (this.opts.submitOnSuccess) {
-      this.form.requestSubmit()
+      this.#form.requestSubmit()
     }
   }
 
@@ -128,7 +128,7 @@ export default class Form<M extends Meta, B extends Body> extends BasePlugin<
     this.uppy.log('[Form] Adding result to the original form:')
     this.uppy.log(result)
 
-    let resultInput: HTMLInputElement | null = this.form.querySelector(
+    let resultInput: HTMLInputElement | null = this.#form.querySelector(
       `[name="${this.opts.resultName}"]`,
     )
     if (resultInput) {
@@ -155,27 +155,27 @@ export default class Form<M extends Meta, B extends Body> extends BasePlugin<
     resultInput.type = 'hidden'
     resultInput.value = JSON.stringify([result])
 
-    this.form.appendChild(resultInput)
+    this.#form.appendChild(resultInput)
   }
 
   getMetaFromForm(): void {
-    const formMeta = getFormData(this.form)
+    const formMeta = getFormData(this.#form)
     // We want to exclude meta the the Form plugin itself has added
     // See https://github.com/transloadit/uppy/issues/1637
     delete formMeta[this.opts.resultName]
     this.uppy.setMeta(formMeta)
   }
 
   install(): void {
-    this.form = assertHTMLFormElement(findDOMElement(this.opts.target))
+    this.#form = assertHTMLFormElement(findDOMElement(this.opts.target))
 
-    this.form.addEventListener('submit', this.handleFormSubmit)
+    this.#form.addEventListener('submit', this.handleFormSubmit)
     this.uppy.on('upload', this.handleUploadStart)
     this.uppy.on('complete', this.handleSuccess)
   }
 
   uninstall(): void {
-    this.form.removeEventListener('submit', this.handleFormSubmit)
+    this.#form.removeEventListener('submit', this.handleFormSubmit)
     this.uppy.off('upload', this.handleUploadStart)
     this.uppy.off('complete', this.handleSuccess)
   }