From 856661debbe1a5fb1a1a716cea32461c89b0c57c Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@roe.dev>
Date: Mon, 8 Feb 2021 22:29:22 +0000
Subject: [PATCH 1/7] feat(replace): prevent accidental replacement within
 assignment

---
 packages/replace/src/index.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/replace/src/index.js b/packages/replace/src/index.js
index e662a056c..486996372 100755
--- a/packages/replace/src/index.js
+++ b/packages/replace/src/index.js
@@ -43,8 +43,8 @@ export default function replace(options = {}) {
     .sort(longest)
     .map(escape);
   const pattern = delimiters
-    ? new RegExp(`${escape(delimiters[0])}(${keys.join('|')})${escape(delimiters[1])}`, 'g')
-    : new RegExp(`\\b(${keys.join('|')})\\b`, 'g');
+    ? new RegExp(`${escape(delimiters[0])}(${keys.join('|')})${escape(delimiters[1])}(?!\\s*=[^=])`, 'g')
+    : new RegExp(`\\b(${keys.join('|')})\\b(?!\\s*=[^=])`, 'g');
 
   return {
     name: 'replace',

From 5eede9aabc5fe2cf3f59869f1e6408462ab6698a Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@roe.dev>
Date: Mon, 8 Feb 2021 23:01:49 +0000
Subject: [PATCH 2/7] test: add test

---
 packages/replace/src/index.js                   |   5 ++++-
 .../test/fixtures/form/assignment/_config.js    |   6 ++++++
 .../test/fixtures/form/assignment/input.js      |   1 +
 .../test/fixtures/form/assignment/output.js     |   1 +
 packages/replace/test/snapshots/form.js.md      |   6 ++++++
 packages/replace/test/snapshots/form.js.snap    | Bin 439 -> 492 bytes
 6 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100755 packages/replace/test/fixtures/form/assignment/_config.js
 create mode 100755 packages/replace/test/fixtures/form/assignment/input.js
 create mode 100755 packages/replace/test/fixtures/form/assignment/output.js

diff --git a/packages/replace/src/index.js b/packages/replace/src/index.js
index 486996372..6f28ea4f6 100755
--- a/packages/replace/src/index.js
+++ b/packages/replace/src/index.js
@@ -43,7 +43,10 @@ export default function replace(options = {}) {
     .sort(longest)
     .map(escape);
   const pattern = delimiters
-    ? new RegExp(`${escape(delimiters[0])}(${keys.join('|')})${escape(delimiters[1])}(?!\\s*=[^=])`, 'g')
+    ? new RegExp(
+        `${escape(delimiters[0])}(${keys.join('|')})${escape(delimiters[1])}(?!\\s*=[^=])`,
+        'g'
+      )
     : new RegExp(`\\b(${keys.join('|')})\\b(?!\\s*=[^=])`, 'g');
 
   return {
diff --git a/packages/replace/test/fixtures/form/assignment/_config.js b/packages/replace/test/fixtures/form/assignment/_config.js
new file mode 100755
index 000000000..689496e7f
--- /dev/null
+++ b/packages/replace/test/fixtures/form/assignment/_config.js
@@ -0,0 +1,6 @@
+module.exports = {
+  description: "doesn't replace lvalue in assignment",
+  options: {
+    'process.env.DEBUG': 'replaced'
+  }
+};
diff --git a/packages/replace/test/fixtures/form/assignment/input.js b/packages/replace/test/fixtures/form/assignment/input.js
new file mode 100755
index 000000000..5fa7f8f80
--- /dev/null
+++ b/packages/replace/test/fixtures/form/assignment/input.js
@@ -0,0 +1 @@
+process.env.DEBUG = 'test';
diff --git a/packages/replace/test/fixtures/form/assignment/output.js b/packages/replace/test/fixtures/form/assignment/output.js
new file mode 100755
index 000000000..5fa7f8f80
--- /dev/null
+++ b/packages/replace/test/fixtures/form/assignment/output.js
@@ -0,0 +1 @@
+process.env.DEBUG = 'test';
diff --git a/packages/replace/test/snapshots/form.js.md b/packages/replace/test/snapshots/form.js.md
index 899dcad4a..d35412356 100644
--- a/packages/replace/test/snapshots/form.js.md
+++ b/packages/replace/test/snapshots/form.js.md
@@ -58,3 +58,9 @@ Generated by [AVA](https://ava.li).
     `const one = 1; // eslint-disable-line␊
     ␊
     console.log(one);`
+
+## assignment: doesn't replace lvalue in assignment
+
+> Snapshot 1
+
+    'process.env.DEBUG = \'test\';'
diff --git a/packages/replace/test/snapshots/form.js.snap b/packages/replace/test/snapshots/form.js.snap
index bd26185e9658bbc1e67683ad93dc1a42d42b2817..fdeb4d7d8de0f2ebd74e19e5a944c81335320b11 100644
GIT binary patch
literal 492
zcmV<I0Tcc~RzV<BZeeh9Xm4~Nb}|YA0K~)XvHCFvPmYA1qfU&OpC5||00000000BK
z#=yY9!N7hzYtHl!YEg*`*(}wU<gH|6009G#-1#HdO3xk;4&yRcn)dHiAtP8c0*F;l
zd_S&v&1Pd}&%-TUm7jhwf<+sFc;%c^Vj8=q1>8Rql=&{Rp@$JHx*Ld({$yyIF!^ni
z6t9+TpvW`@MzH7yAifnT{`Zh!);5MUHcNOM*SIo*MXi7ix%YNWOUlPbXV>c``CMbX
zvzZYrIv0pvtxjDpe4uOht)1&G%buC3&IlHL48+U~>|h@-vN8xVDkbOV73b%q>gD98
zYp5rsmLw{ar4|)u=I1FG>KW)6sB2oIsFzBuD9A4=QAkNmODxSPQBcavD=00|%PLkv
zRVQ6gl%JehT&$OxSElFU>J;j(V5^{Bl3HA%j;c@x#Q}-Mx|t<FI~DZx6;g|HGV@Aw
zQ!<MalX6mZft*wno$AOsO^k@sWP_|JflEQ5D77FbF*!8_$h1*a$S=xF&&*5AQMCi}
zVO#|uKLITyLh+cClA4p5n^^)3NFb*;zqBYhH8-&U&h`bfGxL&jN>fsStken!3*8C}
ikQF5g`FW|pz%#_<KQ1n0mjD%OS_1%<5GY-_0ssJ>(b;kU

delta 422
zcmV;X0a^a+1GfWzK~_N^Q*L2!b7*gLAa*he0swkX7^Rb&ZszarFxIpzzs?_v2mk;8
z00003+rz-Xz|L?hQvB~B!>nx#YiySAIIeMJWB>s#klgXCInzI=MI|m|vs7P_w~`So
zS_Q=S-mYm$`S|GUdc7o{Ym9d`GlE6$0`bZ@r^GaNO$)exe<mpNU1mcMBUn@%Xz0<O
z3~du8zm1aO)v^r~nWn%97WDyQj`K&Zm7YBy9L8m?H0|H3LPoG?2@t<pow{E5K-cbD
zJJ(&7Ju_3C5iGh3h?#*d2LVP_20=!f<ovwi{G3$1ocwf+1TF=IqSS(%#N^ZzAk#)w
zA-^ayJu@#gF-O%7%!hFmfcykaYZQ}|kWErgN-arLC`&CW&dkqKFw`^9Gf+oUABxB3
zl+>Ke+{_Z7c9X6F9cM{8C{9W&*3B#dx<Wx;Um>+PCo``^Hzl(;F)1fi7syFP(W#EC
z)5M54O;V{91^GoKK-Z@wmgbZwC}rjql$Pja6)T}S%K~J0i9&u}s)DV8Augl2xRBid
QRIF(Y0BeihjCKM502RBrp#T5?


From a24e2797e9a3f9ef728dd0f16138643d7f7ebc92 Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@parentscheme.com>
Date: Mon, 15 Feb 2021 11:45:12 +0000
Subject: [PATCH 3/7] fix: gate behaviour behind `preventAssignment` option and
 warn if not configured

---
 packages/replace/README.md                      |  7 +++++++
 packages/replace/src/index.js                   | 17 +++++++++++------
 .../test/fixtures/form/assignment/_config.js    |  3 ++-
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/packages/replace/README.md b/packages/replace/README.md
index 1e785b210..e1b7e4394 100644
--- a/packages/replace/README.md
+++ b/packages/replace/README.md
@@ -65,6 +65,13 @@ Default: `['\b', '\b']`
 
 Specifies the boundaries around which strings will be replaced. By default, delimiters are [word boundaries](https://www.regular-expressions.info/wordboundaries.html). See [Word Boundaries](#word-boundaries) below for more information.
 
+### `preventAssignment`
+
+Type: `Boolean`<br>
+Default: `false`
+
+Prevents replacing strings where they are followed by a single equals sign (e.g. `process.env.DEBUG = false'`).
+
 ### `exclude`
 
 Type: `String` | `Array[...String]`<br>
diff --git a/packages/replace/src/index.js b/packages/replace/src/index.js
index 6f28ea4f6..6f159230b 100755
--- a/packages/replace/src/index.js
+++ b/packages/replace/src/index.js
@@ -37,17 +37,22 @@ function mapToFunctions(object) {
 
 export default function replace(options = {}) {
   const filter = createFilter(options.include, options.exclude);
-  const { delimiters } = options;
+  const { delimiters, preventAssignment } = options;
   const functionValues = mapToFunctions(getReplacements(options));
-  const keys = Object.keys(functionValues)
-    .sort(longest)
-    .map(escape);
+  const keys = Object.keys(functionValues).sort(longest).map(escape);
+  if (![true, false].includes(preventAssignment)) {
+    // eslint-disable-next-line no-console
+    console.warn(
+      "replace: 'preventAssignment' currently defaults to false. It is recommended to configure this option explicitly, as it may default to true in a future major version."
+    );
+  }
+  const lookahead = preventAssignment ? '(?!\\s*=[^=])' : '';
   const pattern = delimiters
     ? new RegExp(
-        `${escape(delimiters[0])}(${keys.join('|')})${escape(delimiters[1])}(?!\\s*=[^=])`,
+        `${escape(delimiters[0])}(${keys.join('|')})${escape(delimiters[1])}${lookahead}`,
         'g'
       )
-    : new RegExp(`\\b(${keys.join('|')})\\b(?!\\s*=[^=])`, 'g');
+    : new RegExp(`\\b(${keys.join('|')})\\b${lookahead}`, 'g');
 
   return {
     name: 'replace',
diff --git a/packages/replace/test/fixtures/form/assignment/_config.js b/packages/replace/test/fixtures/form/assignment/_config.js
index 689496e7f..20a53b81e 100755
--- a/packages/replace/test/fixtures/form/assignment/_config.js
+++ b/packages/replace/test/fixtures/form/assignment/_config.js
@@ -1,6 +1,7 @@
 module.exports = {
   description: "doesn't replace lvalue in assignment",
   options: {
-    'process.env.DEBUG': 'replaced'
+    'process.env.DEBUG': 'replaced',
+    preventAssignment: true
   }
 };

From ec2ea7991ba89f24f1c243b0bb73355243ed6b8a Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@parentscheme.com>
Date: Mon, 15 Feb 2021 11:49:53 +0000
Subject: [PATCH 4/7] fix: typo

---
 packages/replace/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/replace/README.md b/packages/replace/README.md
index e1b7e4394..062fe964b 100644
--- a/packages/replace/README.md
+++ b/packages/replace/README.md
@@ -70,7 +70,7 @@ Specifies the boundaries around which strings will be replaced. By default, deli
 Type: `Boolean`<br>
 Default: `false`
 
-Prevents replacing strings where they are followed by a single equals sign (e.g. `process.env.DEBUG = false'`).
+Prevents replacing strings where they are followed by a single equals sign (e.g. `process.env.DEBUG = false`).
 
 ### `exclude`
 

From 87946ba5cc3d029c8390e293d6df25699a75161a Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@parentscheme.com>
Date: Mon, 15 Feb 2021 14:59:02 +0000
Subject: [PATCH 5/7] docs(replace): update readme with example

---
 packages/replace/README.md | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/packages/replace/README.md b/packages/replace/README.md
index 062fe964b..abb42e5f7 100644
--- a/packages/replace/README.md
+++ b/packages/replace/README.md
@@ -70,7 +70,35 @@ Specifies the boundaries around which strings will be replaced. By default, deli
 Type: `Boolean`<br>
 Default: `false`
 
-Prevents replacing strings where they are followed by a single equals sign (e.g. `process.env.DEBUG = false`).
+Prevents replacing strings where they are followed by a single equals sign. For example, where the plugin is called as follows:
+
+```js
+replace({
+  values: {
+    'process.env.DEBUG': 'false',
+  },
+});
+```
+
+Observe the following code:
+
+```js
+// Input
+process.env.DEBUG = false;
+if (process.env.DEBUG == true) {
+  //
+}
+// Without `preventAssignment`
+false = false; // this throws an error because false cannot be assigned to
+if (false == true) {
+  //
+}
+// With `preventAssignment`
+process.env.DEBUG = false;
+if (false == true) {
+  //
+}
+```
 
 ### `exclude`
 

From b6f6a5f83aed82571529b9e592f6fd037e82d8d4 Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@parentscheme.com>
Date: Mon, 15 Feb 2021 14:59:43 +0000
Subject: [PATCH 6/7] refactor(replace): use plugin warning system and update
 text

---
 packages/replace/src/index.js | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/packages/replace/src/index.js b/packages/replace/src/index.js
index 6f159230b..28aa0e34b 100755
--- a/packages/replace/src/index.js
+++ b/packages/replace/src/index.js
@@ -40,12 +40,6 @@ export default function replace(options = {}) {
   const { delimiters, preventAssignment } = options;
   const functionValues = mapToFunctions(getReplacements(options));
   const keys = Object.keys(functionValues).sort(longest).map(escape);
-  if (![true, false].includes(preventAssignment)) {
-    // eslint-disable-next-line no-console
-    console.warn(
-      "replace: 'preventAssignment' currently defaults to false. It is recommended to configure this option explicitly, as it may default to true in a future major version."
-    );
-  }
   const lookahead = preventAssignment ? '(?!\\s*=[^=])' : '';
   const pattern = delimiters
     ? new RegExp(
@@ -57,6 +51,15 @@ export default function replace(options = {}) {
   return {
     name: 'replace',
 
+    buildStart() {
+      if (!preventAssignment) {
+        this.warn({
+          message:
+            "@rollup/plugin-replace: 'preventAssignment' currently defaults to false. It is recommended to set this option to `true`, as the next major version will default this option to `true`."
+        });
+      }
+    },
+
     renderChunk(code, chunk) {
       const id = chunk.fileName;
       if (!keys.length) return null;

From 29adf93934aac1401df18399d42ded41c6d5827f Mon Sep 17 00:00:00 2001
From: Daniel Roe <daniel@parentscheme.com>
Date: Mon, 15 Feb 2021 15:19:45 +0000
Subject: [PATCH 7/7] feat(replace): only warn if no value is explicitly
 provided

---
 packages/replace/src/index.js                |   2 +-
 packages/replace/test/misc.js                |  17 +++++++++
 packages/replace/test/snapshots/misc.js.md   |  21 ++++++++++
 packages/replace/test/snapshots/misc.js.snap | Bin 444 -> 716 bytes
 packages/replace/test/sourcemaps.js          |  38 ++++++++++++++++---
 5 files changed, 72 insertions(+), 6 deletions(-)

diff --git a/packages/replace/src/index.js b/packages/replace/src/index.js
index 28aa0e34b..de9262d59 100755
--- a/packages/replace/src/index.js
+++ b/packages/replace/src/index.js
@@ -52,7 +52,7 @@ export default function replace(options = {}) {
     name: 'replace',
 
     buildStart() {
-      if (!preventAssignment) {
+      if (![true, false].includes(preventAssignment)) {
         this.warn({
           message:
             "@rollup/plugin-replace: 'preventAssignment' currently defaults to false. It is recommended to set this option to `true`, as the next major version will default this option to `true`."
diff --git a/packages/replace/test/misc.js b/packages/replace/test/misc.js
index d0a731340..a4aa82aab 100644
--- a/packages/replace/test/misc.js
+++ b/packages/replace/test/misc.js
@@ -1,5 +1,7 @@
 /* eslint-disable consistent-return */
 
+const { join } = require('path');
+
 const test = require('ava');
 const { rollup } = require('rollup');
 
@@ -64,3 +66,18 @@ test('can be configured with output plugins', async (t) => {
   t.is(code.trim(), 'log("environment", "production");');
   t.truthy(map);
 });
+
+process.chdir(join(__dirname, 'fixtures', 'form', 'assignment'));
+
+test.serial('no explicit setting of preventAssignment', async (t) => {
+  const possibleValues = [undefined, true, false];
+  for await (const value of possibleValues) {
+    const warnings = [];
+    await rollup({
+      input: 'input.js',
+      onwarn: (warning) => warnings.push(warning),
+      plugins: [replace({ preventAssignment: value })]
+    });
+    t.snapshot(warnings);
+  }
+});
diff --git a/packages/replace/test/snapshots/misc.js.md b/packages/replace/test/snapshots/misc.js.md
index bea3ff428..273bb9cf6 100644
--- a/packages/replace/test/snapshots/misc.js.md
+++ b/packages/replace/test/snapshots/misc.js.md
@@ -45,3 +45,24 @@ Generated by [AVA](https://ava.li).
       name: null,
       source: 'main.js',
     }
+
+## no explicit setting of preventAssignment
+
+> Snapshot 1
+
+    [
+      {
+        code: 'PLUGIN_WARNING',
+        message: '@rollup/plugin-replace: \'preventAssignment\' currently defaults to false. It is recommended to set this option to `true`, as the next major version will default this option to `true`.',
+        plugin: 'replace',
+        toString: Function {},
+      },
+    ]
+
+> Snapshot 2
+
+    []
+
+> Snapshot 3
+
+    []
diff --git a/packages/replace/test/snapshots/misc.js.snap b/packages/replace/test/snapshots/misc.js.snap
index f47b938213a3887c798cb50fb2177207fa0221df..d4325ce9f8ff2aedb31250fba0e7889fe75a8ddb 100644
GIT binary patch
literal 716
zcmV;-0yF(VRzV<BZeeh9Xm4~Nb}|YA0QdJV@FA5I?5mzKgqun0xgU!N00000000B6
zQ$1)DK@^^MyO+eD<Z@_Z6GjlC5KpwQ2q_W-V~Ct$h*ri-_U7(3&dw||v$-T%L~SfA
zEEFrjLQv9a5wW%r8zG&A!Ah_Z8#@c%?%ti}nw<D^@G-ORXTJBo_wG6&#3AL!Z{IYY
zduw0%4}P6~|76G^@ox)KKrY20#N5#O=C^0!#=EVLug^RkxDAQ*6JmMx<>v?Mx29j+
zyj%Tn{Nje2Sl65sV{VGgChp{8-rj@<`XD!g=Ly6<=qW;eLTk1H(7F{01p>PX0D(OK
zW38mT!ZSiVLNu_@htPbW=iI^~_blYv*TKO-0{sMB0tJl8?FWZIz6h?TD!lbEaQ^J<
z<W%{}rHKpWsq$ndv^U_!uv#lRw?W3W5+VwZg(9l?@~GyaU>+Z(!=dI&T-pg^{F)5#
zHcY)pYrKdRTH#d|32UfTw916xB|2rPZ>Z*;3NX6DE3waTOKlzPDzv_mv1#7wh|iBu
zhRJnKC118QV2euAC9X{z)bNF9F>Ie*%Cyy!R^RTj*#&_CfEOre%h6}mjMcuZ5jYU%
z7gMSGPDj#<8NliIK)HWRcgLarNl2c=iqEJ>dpuxate5bwa?}$$Tj11}o<fB^J4zW%
zTcU@Xy&RzpR4g*7u2wT?s!9j6>I-g0=t5*^#jnU=OKV(m%`C?^Oq&X06S>=oEN-zx
zPbq0qnR$z`qP!@ccM_2#*0~5f7TrCGXS~6e5!Xm&U*VU1bu!c1<<*&Hp5;2RxUe@n
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ymln-VlCJ&-NsHYYBVGD(wo^2&Y6Wrc9~JFJocn7*djsZ6)bl&dTGQMJ1^@s}(_nxA

literal 444
zcmV;t0Ym;lRzV<BZeeh9Xm4~Nb}|YA0GxszQhcx@&qFGZ%@RDAQXh*500000000B6
zk-tmBKorOClJtjQZHo?0a+?ZLaB(OOf{WlFC^~83np~T!m%DJepska-I65f)3(`Sw
zDL9MZ?B*g)j{XG>Uea2n*a&Li!~J;QckjJ#)&T$ps7$pV-mcl<<I~Ii%H`Mz1krb=
z+26c*y=Wh=-X5LSp69nZR(!h+yG$Bgu6np804B)9*)Ro)Mh9$&P};=9KB56)beFIu
zQUX;8qTCiz5?hrKMm`Jcl%p9*e1>f@i}rAU!hkrDSV_!-nvfo<QAUC}R1Fn!sKcif
zsuNBmRz$xM^h;?iQZD&S#EJ@DLd${&AyaXzSJ4r6=n<}BMV#mo=J$ulLTf><i<%wH
zfo2@0i!i-bZRpk^>~9N&0)ROHO#t&+V@yQ5R1uEYE|%C<M8-E3932p(ZNWm14~bfg
za?*>zFKwmDdR@{~G%d~f&#hUBmGeoJ2V)$2-I$phe6;%;K8{(T&6cG`FwD}{KUi8!
m8Vn@NWq#*q)Kyb+_D4sP3LC#RG~;2)wV&@z{yS~D0{{Tv$jLDP

diff --git a/packages/replace/test/sourcemaps.js b/packages/replace/test/sourcemaps.js
index e9c409c33..b15422388 100644
--- a/packages/replace/test/sourcemaps.js
+++ b/packages/replace/test/sourcemaps.js
@@ -44,7 +44,7 @@ test('generates sourcemaps by default', async (t) => {
     onwarn(warning) {
       throw new Error(warning.message);
     },
-    plugins: [replace({ values: { ANSWER: '42' } }), testPlugin]
+    plugins: [replace({ values: { ANSWER: '42' }, preventAssignment: true }), testPlugin]
   });
 
   const { code, map } = getOutputFromGenerated(
@@ -60,7 +60,14 @@ test('generates sourcemaps if enabled in plugin', async (t) => {
     onwarn(warning) {
       throw new Error(warning.message);
     },
-    plugins: [replace({ values: { ANSWER: '42' }, sourcemap: true }), testPlugin]
+    plugins: [
+      replace({
+        values: { ANSWER: '42' },
+        sourcemap: true,
+        preventAssignment: true
+      }),
+      testPlugin
+    ]
   });
 
   const { code, map } = getOutputFromGenerated(
@@ -76,7 +83,14 @@ test('generates sourcemaps if enabled in plugin (camelcase)', async (t) => {
     onwarn(warning) {
       throw new Error(warning.message);
     },
-    plugins: [replace({ values: { ANSWER: '42' }, sourceMap: true }), testPlugin]
+    plugins: [
+      replace({
+        values: { ANSWER: '42' },
+        sourceMap: true,
+        preventAssignment: true
+      }),
+      testPlugin
+    ]
   });
 
   const { code, map } = getOutputFromGenerated(
@@ -98,7 +112,14 @@ test('does not generate sourcemaps if disabled in plugin', async (t) => {
       );
       warned = true;
     },
-    plugins: [replace({ values: { ANSWER: '42' }, sourcemap: false }), testPlugin]
+    plugins: [
+      replace({
+        values: { ANSWER: '42' },
+        sourcemap: false,
+        preventAssignment: true
+      }),
+      testPlugin
+    ]
   });
 
   t.truthy(!warned);
@@ -118,7 +139,14 @@ test('does not generate sourcemaps if disabled in plugin (camelcase)', async (t)
       );
       warned = true;
     },
-    plugins: [replace({ values: { ANSWER: '42' }, sourceMap: false }), testPlugin]
+    plugins: [
+      replace({
+        values: { ANSWER: '42' },
+        sourceMap: false,
+        preventAssignment: true
+      }),
+      testPlugin
+    ]
   });
 
   t.truthy(!warned);