Eslint config: convert all NEXT_VERSION_ERROR to ERROR

In preparation for next major version.

src/eslint-config-adeira/CHANGELOG.md

@@ -3,6 +3,7 @@
 **Breaking changes ahead!**
 
 - New rules enabled: `fb-flow/use-indexed-access-type` ([more info](https://flow.org/en/docs/types/indexed-access/)) and `ft-flow/enforce-suppression-code` (warnings or errors in strict mode).
+- Many rules that were showing warnings in normal mode but errors in strict mode were converted to normal errors (so there is no difference between normal and strict mode). The best way how to migrate is to temporarily switch to the strict mode and address all the errors before upgrading to this major version.
 - Switched from [`eslint-plugin-flowtype`](https://github.com/gajus/eslint-plugin-flowtype/tree/449cb99f1b6d3bbbb66f5be55f497667f5b2cb31) to [`eslint-plugin-ft-flow`](https://github.com/flow-typed/eslint-plugin-ft-flow/tree/820e631ce491cdf45821744d4e29f348cf776392) which contains the same set of rules but should be more up to date and maintained. We are going to enable additional rules later. There is a possible minor breaking change (with very simple fix) when suppressing the rules manually, for example:
 
   ```diff

src/eslint-config-adeira/__tests__/__snapshots__/index.test.js.snap

@@ -24,33 +24,33 @@ Object {
       ],
       "rules": Object {
         "testing-library/await-async-query": 0,
-        "testing-library/await-async-utils": 1,
+        "testing-library/await-async-utils": 2,
         "testing-library/await-fire-event": 0,
         "testing-library/consistent-data-testid": 0,
-        "testing-library/no-await-sync-events": 1,
-        "testing-library/no-await-sync-query": 1,
+        "testing-library/no-await-sync-events": 2,
+        "testing-library/no-await-sync-query": 2,
         "testing-library/no-container": 0,
-        "testing-library/no-debugging-utils": 1,
+        "testing-library/no-debugging-utils": 2,
         "testing-library/no-dom-import": Array [
-          1,
+          2,
           "react",
         ],
         "testing-library/no-manual-cleanup": 0,
         "testing-library/no-node-access": 0,
-        "testing-library/no-promise-in-fire-event": 1,
+        "testing-library/no-promise-in-fire-event": 2,
         "testing-library/no-render-in-setup": 0,
-        "testing-library/no-unnecessary-act": 1,
-        "testing-library/no-wait-for-empty-callback": 1,
-        "testing-library/no-wait-for-multiple-assertions": 1,
-        "testing-library/no-wait-for-side-effects": 1,
-        "testing-library/no-wait-for-snapshot": 1,
-        "testing-library/prefer-explicit-assert": 1,
-        "testing-library/prefer-find-by": 1,
-        "testing-library/prefer-presence-queries": 1,
-        "testing-library/prefer-query-by-disappearance": 1,
+        "testing-library/no-unnecessary-act": 2,
+        "testing-library/no-wait-for-empty-callback": 2,
+        "testing-library/no-wait-for-multiple-assertions": 2,
+        "testing-library/no-wait-for-side-effects": 2,
+        "testing-library/no-wait-for-snapshot": 2,
+        "testing-library/prefer-explicit-assert": 2,
+        "testing-library/prefer-find-by": 2,
+        "testing-library/prefer-presence-queries": 2,
+        "testing-library/prefer-query-by-disappearance": 2,
         "testing-library/prefer-screen-queries": 0,
-        "testing-library/prefer-user-event": 1,
-        "testing-library/prefer-wait-for": 1,
+        "testing-library/prefer-user-event": 2,
+        "testing-library/prefer-wait-for": 2,
         "testing-library/render-result-naming-convention": 0,
       },
     },
@@ -162,11 +162,11 @@ Object {
     "eslint-comments/no-unused-enable": 2,
     "eslint-comments/no-use": 0,
     "eslint-comments/require-description": 0,
-    "fb-flow/flow-enums-default-if-possible": 1,
-    "fb-flow/no-flow-enums-object-mapping": 1,
-    "fb-flow/use-exact-by-default-object-type": 1,
-    "fb-flow/use-flow-enums": 1,
-    "fb-flow/use-indexed-access-type": 1,
+    "fb-flow/flow-enums-default-if-possible": 2,
+    "fb-flow/no-flow-enums-object-mapping": 2,
+    "fb-flow/use-exact-by-default-object-type": 2,
+    "fb-flow/use-flow-enums": 2,
+    "fb-flow/use-indexed-access-type": 2,
     "flowtype/boolean-style": "off",
     "flowtype/delimiter-dangle": "off",
     "flowtype/generic-spacing": "off",
@@ -186,15 +186,15 @@ Object {
     "ft-flow/define-flow-type": 1,
     "ft-flow/delimiter-dangle": 0,
     "ft-flow/enforce-line-break": 0,
-    "ft-flow/enforce-suppression-code": 1,
+    "ft-flow/enforce-suppression-code": 2,
     "ft-flow/generic-spacing": 0,
     "ft-flow/interface-id-match": 0,
     "ft-flow/newline-after-flow-annotation": Array [
       2,
       "always",
     ],
     "ft-flow/no-dupe-keys": 2,
-    "ft-flow/no-duplicate-type-union-intersection-members": 1,
+    "ft-flow/no-duplicate-type-union-intersection-members": 2,
     "ft-flow/no-existential-type": 2,
     "ft-flow/no-flow-fix-me-comments": 0,
     "ft-flow/no-flow-fix-me-in-strict-files": 0,
@@ -330,7 +330,7 @@ Object {
     "import/no-named-export": 0,
     "import/no-namespace": 0,
     "import/no-nodejs-modules": 0,
-    "import/no-relative-packages": 1,
+    "import/no-relative-packages": 2,
     "import/no-relative-parent-imports": 0,
     "import/no-restricted-paths": 0,
     "import/no-self-import": 2,
@@ -371,7 +371,7 @@ Object {
     "jest/consistent-test-it": 0,
     "jest/expect-expect": 0,
     "jest/max-nested-describe": Array [
-      1,
+      2,
       Object {
         "max": 5,
       },
@@ -400,12 +400,12 @@ Object {
     "jest/no-test-return-statement": 2,
     "jest/prefer-called-with": 2,
     "jest/prefer-expect-assertions": 0,
-    "jest/prefer-expect-resolves": 1,
+    "jest/prefer-expect-resolves": 2,
     "jest/prefer-hooks-on-top": 2,
     "jest/prefer-lowercase-title": 0,
     "jest/prefer-spy-on": 0,
     "jest/prefer-strict-equal": 0,
-    "jest/prefer-to-be": 1,
+    "jest/prefer-to-be": 2,
     "jest/prefer-to-contain": 2,
     "jest/prefer-to-have-length": 2,
     "jest/prefer-todo": 2,
@@ -549,7 +549,7 @@ Object {
     "no-bitwise": 2,
     "no-buffer-constructor": 1,
     "no-caller": 2,
-    "no-case-declarations": 1,
+    "no-case-declarations": 2,
     "no-class-assign": 1,
     "no-comma-dangle": "off",
     "no-compare-neg-zero": 2,
@@ -594,7 +594,7 @@ Object {
     "no-extra-label": 2,
     "no-extra-parens": "off",
     "no-extra-semi": "off",
-    "no-fallthrough": 1,
+    "no-fallthrough": 2,
     "no-floating-decimal": "off",
     "no-func-assign": 2,
     "no-global-assign": Array [
@@ -665,7 +665,7 @@ Object {
     "no-proto": 2,
     "no-prototype-builtins": 2,
     "no-redeclare": Array [
-      1,
+      2,
       Object {
         "builtinGlobals": true,
       },
@@ -887,7 +887,7 @@ Object {
     "react/no-access-state-in-setstate": 2,
     "react/no-adjacent-inline-elements": 0,
     "react/no-array-index-key": 0,
-    "react/no-arrow-function-lifecycle": 1,
+    "react/no-arrow-function-lifecycle": 2,
     "react/no-children-prop": 0,
     "react/no-danger": 0,
     "react/no-danger-with-children": 2,
@@ -896,7 +896,7 @@ Object {
     "react/no-did-update-set-state": 2,
     "react/no-direct-mutation-state": 2,
     "react/no-find-dom-node": 2,
-    "react/no-invalid-html-attribute": 1,
+    "react/no-invalid-html-attribute": 2,
     "react/no-is-mounted": 2,
     "react/no-multi-comp": Array [
       2,
@@ -920,7 +920,7 @@ Object {
         "allowAsProps": true,
       },
     ],
-    "react/no-unused-class-component-methods": 1,
+    "react/no-unused-class-component-methods": 2,
     "react/no-unused-prop-types": 0,
     "react/no-unused-state": 0,
     "react/no-will-update-set-state": 0,
@@ -1043,7 +1043,7 @@ Object {
     "switch-colon-spacing": "off",
     "sx/no-concatenated-classes": 2,
     "sx/no-unused-stylesheet": 2,
-    "sx/use-logical-properties": 1,
+    "sx/use-logical-properties": 2,
     "sx/valid-usage": 2,
     "symbol-description": 2,
     "template-curly-spacing": "off",
@@ -1124,131 +1124,5 @@ Object {
 
 exports[`rules snapshot: diff of stable and strict rules 1`] = `
 Snapshot Diff:
-- Value for stable rules
-+ Value for STRICT rules
-
-@@ --- --- @@
-          "testing-library/await-async-query": 0,
--         "testing-library/await-async-utils": 1,
-+         "testing-library/await-async-utils": 2,
-          "testing-library/await-fire-event": 0,
-          "testing-library/consistent-data-testid": 0,
--         "testing-library/no-await-sync-events": 1,
--         "testing-library/no-await-sync-query": 1,
-+         "testing-library/no-await-sync-events": 2,
-+         "testing-library/no-await-sync-query": 2,
-          "testing-library/no-container": 0,
--         "testing-library/no-debugging-utils": 1,
-+         "testing-library/no-debugging-utils": 2,
-          "testing-library/no-dom-import": Array [
--           1,
-+           2,
-            "react",
-@@ --- --- @@
-          "testing-library/no-node-access": 0,
--         "testing-library/no-promise-in-fire-event": 1,
-+         "testing-library/no-promise-in-fire-event": 2,
-          "testing-library/no-render-in-setup": 0,
--         "testing-library/no-unnecessary-act": 1,
--         "testing-library/no-wait-for-empty-callback": 1,
--         "testing-library/no-wait-for-multiple-assertions": 1,
--         "testing-library/no-wait-for-side-effects": 1,
--         "testing-library/no-wait-for-snapshot": 1,
--         "testing-library/prefer-explicit-assert": 1,
--         "testing-library/prefer-find-by": 1,
--         "testing-library/prefer-presence-queries": 1,
--         "testing-library/prefer-query-by-disappearance": 1,
-+         "testing-library/no-unnecessary-act": 2,
-+         "testing-library/no-wait-for-empty-callback": 2,
-+         "testing-library/no-wait-for-multiple-assertions": 2,
-+         "testing-library/no-wait-for-side-effects": 2,
-+         "testing-library/no-wait-for-snapshot": 2,
-+         "testing-library/prefer-explicit-assert": 2,
-+         "testing-library/prefer-find-by": 2,
-+         "testing-library/prefer-presence-queries": 2,
-+         "testing-library/prefer-query-by-disappearance": 2,
-          "testing-library/prefer-screen-queries": 0,
--         "testing-library/prefer-user-event": 1,
--         "testing-library/prefer-wait-for": 1,
-+         "testing-library/prefer-user-event": 2,
-+         "testing-library/prefer-wait-for": 2,
-          "testing-library/render-result-naming-convention": 0,
-@@ --- --- @@
-      "eslint-comments/require-description": 0,
--     "fb-flow/flow-enums-default-if-possible": 1,
--     "fb-flow/no-flow-enums-object-mapping": 1,
--     "fb-flow/use-exact-by-default-object-type": 1,
--     "fb-flow/use-flow-enums": 1,
--     "fb-flow/use-indexed-access-type": 1,
-+     "fb-flow/flow-enums-default-if-possible": 2,
-+     "fb-flow/no-flow-enums-object-mapping": 2,
-+     "fb-flow/use-exact-by-default-object-type": 2,
-+     "fb-flow/use-flow-enums": 2,
-+     "fb-flow/use-indexed-access-type": 2,
-      "flowtype/boolean-style": "off",
-@@ --- --- @@
-      "ft-flow/enforce-line-break": 0,
--     "ft-flow/enforce-suppression-code": 1,
-+     "ft-flow/enforce-suppression-code": 2,
-      "ft-flow/generic-spacing": 0,
-@@ --- --- @@
-      "ft-flow/no-dupe-keys": 2,
--     "ft-flow/no-duplicate-type-union-intersection-members": 1,
-+     "ft-flow/no-duplicate-type-union-intersection-members": 2,
-      "ft-flow/no-existential-type": 2,
-@@ --- --- @@
-      "import/no-nodejs-modules": 0,
--     "import/no-relative-packages": 1,
-+     "import/no-relative-packages": 2,
-      "import/no-relative-parent-imports": 0,
-@@ --- --- @@
-      "jest/max-nested-describe": Array [
--       1,
-+       2,
-        Object {
-@@ --- --- @@
-      "jest/prefer-expect-assertions": 0,
--     "jest/prefer-expect-resolves": 1,
-+     "jest/prefer-expect-resolves": 2,
-      "jest/prefer-hooks-on-top": 2,
-@@ --- --- @@
-      "jest/prefer-strict-equal": 0,
--     "jest/prefer-to-be": 1,
-+     "jest/prefer-to-be": 2,
-      "jest/prefer-to-contain": 2,
-@@ --- --- @@
-      "no-caller": 2,
--     "no-case-declarations": 1,
-+     "no-case-declarations": 2,
-      "no-class-assign": 1,
-@@ --- --- @@
-      "no-extra-semi": "off",
--     "no-fallthrough": 1,
-+     "no-fallthrough": 2,
-      "no-floating-decimal": "off",
-@@ --- --- @@
-      "no-redeclare": Array [
--       1,
-+       2,
-        Object {
-@@ --- --- @@
-      "react/no-array-index-key": 0,
--     "react/no-arrow-function-lifecycle": 1,
-+     "react/no-arrow-function-lifecycle": 2,
-      "react/no-children-prop": 0,
-@@ --- --- @@
-      "react/no-find-dom-node": 2,
--     "react/no-invalid-html-attribute": 1,
-+     "react/no-invalid-html-attribute": 2,
-      "react/no-is-mounted": 2,
-@@ --- --- @@
-      ],
--     "react/no-unused-class-component-methods": 1,
-+     "react/no-unused-class-component-methods": 2,
-      "react/no-unused-prop-types": 0,
-@@ --- --- @@
-      "sx/no-unused-stylesheet": 2,
--     "sx/use-logical-properties": 1,
-+     "sx/use-logical-properties": 2,
-      "sx/valid-usage": 2,
+Compared values have no visual difference.
 `;