Lint against strings without wrapping <Text> (#3398)

* Add a rudimentary rule

* Get the rule passing

* Support special-casing text props

* More tests

eslint/avoid-unwrapped-text.js

@@ -0,0 +1,111 @@
+'use strict'
+
+// Partially based on eslint-plugin-react-native.
+// Portions of code by Alex Zhukov, MIT license.
+
+function hasOnlyLineBreak(value) {
+  return /^[\r\n\t\f\v]+$/.test(value.replace(/ /g, ''))
+}
+
+function getTagName(node) {
+  const reversedIdentifiers = []
+  if (
+    node.type === 'JSXElement' &&
+    node.openingElement.type === 'JSXOpeningElement'
+  ) {
+    let object = node.openingElement.name
+    while (object.type === 'JSXMemberExpression') {
+      if (object.property.type === 'JSXIdentifier') {
+        reversedIdentifiers.push(object.property.name)
+      }
+      object = object.object
+    }
+
+    if (object.type === 'JSXIdentifier') {
+      reversedIdentifiers.push(object.name)
+    }
+  }
+
+  return reversedIdentifiers.reverse().join('.')
+}
+
+exports.create = function create(context) {
+  const options = context.options[0] || {}
+  const impliedTextProps = options.impliedTextProps ?? []
+  const impliedTextComponents = options.impliedTextComponents ?? []
+  const textProps = [...impliedTextProps]
+  const textComponents = ['Text', ...impliedTextComponents]
+  return {
+    JSXText(node) {
+      if (typeof node.value !== 'string' || hasOnlyLineBreak(node.value)) {
+        return
+      }
+      let parent = node.parent
+      while (parent) {
+        if (parent.type === 'JSXElement') {
+          const tagName = getTagName(parent)
+          if (textComponents.includes(tagName) || tagName.endsWith('Text')) {
+            // We're good.
+            return
+          }
+          if (tagName === 'Trans') {
+            // Skip over it and check above.
+            // TODO: Maybe validate that it's present.
+            parent = parent.parent
+            continue
+          }
+          let message = 'Wrap this string in <Text>.'
+          if (tagName !== 'View') {
+            message +=
+              ' If <' +
+              tagName +
+              '> is guaranteed to render <Text>, ' +
+              'rename it to <' +
+              tagName +
+              'Text> or add it to impliedTextComponents.'
+          }
+          context.report({
+            node,
+            message,
+          })
+          return
+        }
+
+        if (
+          parent.type === 'JSXAttribute' &&
+          parent.name.type === 'JSXIdentifier' &&
+          parent.parent.type === 'JSXOpeningElement' &&
+          parent.parent.parent.type === 'JSXElement'
+        ) {
+          const tagName = getTagName(parent.parent.parent)
+          const propName = parent.name.name
+          if (
+            textProps.includes(tagName + ' ' + propName) ||
+            propName === 'text' ||
+            propName.endsWith('Text')
+          ) {
+            // We're good.
+            return
+          }
+          const message =
+            'Wrap this string in <Text>.' +
+            ' If `' +
+            propName +
+            '` is guaranteed to be wrapped in <Text>, ' +
+            'rename it to `' +
+            propName +
+            'Text' +
+            '` or add it to impliedTextProps.'
+          context.report({
+            node,
+            message,
+          })
+          return
+        }
+
+        parent = parent.parent
+        continue
+      }
+    },
+  }
+}